Book Anatomy · Crime and mystery
Anatomy of The Red Thumb Mark
R. Austin Freeman, 1907. Public domain in the UK and the US. Forensic detection; science as clue.
Ask The Red Thumb Mark a question about its craft (free beta)
Answers cite chapter and paragraph, and every quote is checked against the text. (3 free questions a day).
70,853 words
17 chapters
52% dialogue
18.3 words a sentence
first person
4.7 hours to read
Lessons to borrow
- Scientific evidence and careful observation can expose truth that circumstantial evidence obscures; the novel demonstrates how systematic investigation using magnification, photography, and deduction reveals forgery that fooled expert witnesses.
- Personal conflict between duty and desire need not be resolved by sacrifice; Jervis learns that professional obligation and romantic love can coexist once the case concludes, suggesting that timing and context matter as much as the conflict itself.
- Ingenious villainy often contains the seeds of its own exposure; Walter's mechanical skill, which enabled the forgery and assassination attempts, also left identifying marks on the typewriter and devices that betrayed him to Thorndyke's analytical mind.
All 180 lenses
The 20 lenses below are the most asked for. The full set of 180 is grouped in 12 pages:
Beat positions Both
Story and structure · lens A1 · compare across books
| Beat | Where | Our reading | |
|---|---|---|---|
| Inciting incident | Ch 2 (CHAPTER II), about 6% through | Reuben Hornby arrives with his solicitor asking Thorndyke to defend him against a diamond theft charge with damning thumb-print evidence. | |
| First turning point | Ch 3 (CHAPTER III), about 12% through | Thorndyke begins scientific investigation of the thumb-prints and Jervis meets Juliet Gibson, who offers financial support and hints at doubts about Walter. | |
| Midpoint | Ch 10 (CHAPTER X), about 44% through | Thorndyke orders mysterious boxwood pieces and Juliet reveals crucial details about bloody finger-marks made by Reuben in John Hornby's study. | |
| Low point | Ch 12 (CHAPTER XII), about 56% through | Jervis withdraws emotionally from Juliet due to conflict between love and duty, causing their growing friendship to collapse. | |
| Climax | Ch 16 (CHAPTER XVI), about 91% through | Thorndyke proves the thumb-print is a forgery made from the Thumbograph using wooden stamps and defibrinated blood, securing Reuben's acquittal. | |
| Resolution | Ch 17 (CHAPTER XVII), about 99% through | Jervis learns Juliet was never engaged to Reuben and confesses his love to her in Fountain Court. |
I did not commit this robbery and that I know nothing whatever about it or about the thumb-print that was found in the safe (Ch 2, para 51)
I make it a rule, in all cases, to proceed on the strictly classical lines of inductive inquiry--collect facts, make hypotheses, test them and seek for verification (Ch 3, para 13)
Twenty-four of these to be turned up in the best-seasoned boxwood! What can they be for? (Ch 10, para 19)
No. I am of opinion that it was not made by a human thumb at all. (Ch 16, para 30)
Percent is the middle of that chapter as a share of all words. The beat labels are our AI reading of the chapter notes.
Chapter length chart Count
Pace · lens D1 · compare across books
17 chapters. Median 3,541 words, shortest 1,949, longest 9,578. Whole book 70,853 words, about 4.7 hours at 250 words a minute.
Each bar is one chapter in reading order. Hover for the title and count.
Dialogue share per chapter Count
Dialogue and voice · lens C1 · compare across books
52% of all words are dialogue. A further 11% is long told stories inside quote marks (a narrator within the story), which we count apart. Speech tags: "said" is 43% of tag verbs we found.
Cast and presence map Count
Character · lens B1, B2 · compare across books
| Character | Role (our reading) | Share of mentions | Chapters on page | First appears |
|---|---|---|---|---|
| Dr. Thorndyke | mentor | 30% | 17 of 17 | Ch 1, para 5 |
| Reuben Hornby | ally | 15% | 14 of 17 | Ch 2, para 2 |
| Juliet Gibson | love interest | 13% | 14 of 17 | Ch 3, para 38 |
| Mrs. Hornby | minor | 8% | 10 of 17 | Ch 2, para 36 |
| Walter Hornby | antagonist | 7% | 12 of 17 | Ch 2, para 4 |
| Polton | ally | 6% | 14 of 17 | Ch 1, para 20 |
| Mr. Anstey | ally | 6% | 6 of 17 | Ch 6, para 13 |
| Dr. Jervis | lead | 5% | 16 of 17 | Ch 1, para 4 |
| John Hornby | minor | 3% | 10 of 17 | Ch 1, para 27 |
| Mr. Singleton | minor | 3% | 4 of 17 | Ch 3, para 89 |
| Sir Hector Trumpler | minor | 3% | 2 of 17 | Ch 15, para 26 |
| Mr. Lawley | minor | 3% | 7 of 17 | Ch 1, para 41 |
Who is on the page, chapter by chapter
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dr. Thorndyke | |||||||||||||||||
| Reuben Hornby | |||||||||||||||||
| Juliet Gibson | |||||||||||||||||
| Mrs. Hornby | |||||||||||||||||
| Walter Hornby | |||||||||||||||||
| Polton | |||||||||||||||||
| Mr. Anstey | |||||||||||||||||
| Dr. Jervis | |||||||||||||||||
| John Hornby | |||||||||||||||||
| Mr. Singleton |
Most shared chapters: Dr. Jervis and Dr. Thorndyke (16), Dr. Thorndyke and Polton (14), Dr. Jervis and Polton (14), Dr. Thorndyke and Reuben Hornby (14), Dr. Jervis and Reuben Hornby (14).
Counts use the names and aliases in our cast list. A name in narration or speech counts as a mention.
Chapter ending hooks AI
Pace · lens D8 · compare across books
Chapter endings: 7 quiet, 4 reveal, 4 question, 2 cliffhanger.
Chapters typically end with questions or revelations that propel the investigation forward, such as Thorndyke's mysterious accident, the poisoned cigar discovery, or the revelation of Walter's Blickensderfer typewriter. The final chapter ends quietly with Jervis and Juliet walking hand in hand through the cloisters, providing emotional resolution rather than suspense.
Every chapter ending
- Ch 1: quiet. The chapter ends with them parting ways at Middle Temple Lane, agreeing to meet at seven o'clock
- Ch 2: reveal. Thorndyke agrees to take the case and offers Jervis employment to help investigate, ending with them settling terms for the next day
- Ch 3: question. Thorndyke and Jervis leave Scotland Yard with photographs and evidence, with Thorndyke hinting at a psychological problem to solve regarding Miss Gibson's relations with the two young men
- Ch 4: quiet. Jervis and Miss Gibson part ways with an arrangement to meet at Thorndyke's chambers at eight o'clock, with Jervis promising to see her again soon
- Ch 5: quiet. The chapter ends with Thorndyke and Jervis walking back to his chambers, with Thorndyke suggesting that Jervis discover Miss Gibson's actual relation to Reuben Hornby
- Ch 6: quiet. Jervis turns toward Soho for lunch after learning prison visiting regulations, the case moving forward to trial with no resolution in sight
- Ch 7: question. Jervis walks through thickening fog contemplating a new theory of the crime, wondering if John Hornby could be the actual thief
I was so much excited and elated by my own ingenuity in having formed an intelligible and practicable theory of the crime (Ch 7, para 49)
- Ch 8: question. Jervis retires to bed convinced Thorndyke has hidden facts or a superior explanation for the crime that he has not yet revealed
- Ch 9: quiet. Jervis and Juliet leave the prison together, with Jervis offering to accompany her on future visits, deepening his entanglement
a black-painted prison van turned into the courtyard with its freight of squalid misery (Ch 9, para 54)
- Ch 10: reveal. Thorndyke reveals he already knew the information Jervis has gathered and suggests Jervis should have deduced the purpose of the boxwood pieces through constructive imagination
- Ch 11: reveal. Thorndyke reveals the weapon's ingenious design and his theory that the assailant is someone about whom he holds exclusive damaging information
- Ch 12: quiet. Jervis watches Juliet's omnibus depart, walking home alone in deep despondency after their emotional separation
- Ch 13: question. Thorndyke promises to place the cigar in Dr. Chandler's custody for analysis and then decide on action, leaving the assailant's identity unresolved
To-morrow you shall come with me to the hospital and see me place the ends of the cigar in the custody of Dr. Chandler (Ch 13, para 82)
- Ch 14: cliffhanger. The trial is about to begin with the revelation that Walter Hornby may be the assailant, but Jervis has not yet informed Thorndyke of this discovery
- Ch 15: cliffhanger. The defence is about to begin; Juliet despairs that the expert evidence is crushing, but Jervis hints there must be a way to prove innocence
such a coincidence is an utter impossibility (Ch 15, para 206)
- Ch 16: reveal. The jury returns a not guilty verdict almost immediately; the judge praises Thorndyke and Reuben is freed with his character fully vindicated
Not guilty," replied the foreman, raising his voice and glancing at Reuben. (Ch 16, para 175)
- Ch 17: quiet. The chapter ends with Jervis and Juliet walking through the cloisters hand in hand, their love confirmed but unspoken aloud, marked by the simple phrase 'and so we passed through into the cloisters' followed by 'THE END'.
Viewpoint per chapter Both
Viewpoint and narration · lens E2 · compare across books
Counted: the narration is mostly first person (first person words per 1,000 outside speech: 49.6).
The entire novel is narrated in first person by Dr. Jervis, giving readers access to his thoughts, feelings, and deductions while maintaining mystery about Thorndyke's full knowledge and plans. This creates dramatic irony as Jervis pieces together clues that Thorndyke has already understood.
- Ch 1 to 10: Jervis
- Ch 11 to 14: Dr. Jervis
- Ch 15 to 16: Dr. Jervis (narrator)
- Ch 17: Dr. Jervis
Want and need of the lead AI
Character · lens B3 · compare across books
| Lead | Dr. Jervis |
|---|---|
| Wants | To help Thorndyke defend Reuben Hornby against a charge of diamond theft and prove his innocence through scientific investigation. |
| Needs | To learn that love and duty can coexist, and to find personal happiness beyond professional obligation. |
| False belief | That his feelings for Juliet Gibson are incompatible with his duty to Thorndyke and the case. |
| Arc | positive. Jervis moves from unemployment and emotional confusion to meaningful work, scientific understanding, and romantic fulfilment. |
Scene log AI
Story and structure · lens A4 · compare across books
One line per chapter: goal, conflict, outcome
| Ch | Summary | Goal | Conflict | Outcome |
|---|---|---|---|---|
| 1 | Jervis encounters his old friend Thorndyke by chance in the Temple and learns that the medical practitioner has become a barrister and legal expert in scientific matters. | Jervis seeks to reconnect with Thorndyke and learn what he has been doing | Jervis is surprised to find Thorndyke transformed into a lawyer rather than a doctor | They arrange to meet that evening at Thorndyke's chambers to catch up |
| 2 | A young man named Reuben Hornby arrives with his solicitor to ask Thorndyke to defend him against a charge of stealing diamonds, with damning evidence being a thumb-print found in blood at the crime scene. | Reuben seeks Thorndyke's help to defend him against a theft charge | A thumb-print identified as Reuben's was found in blood in the safe where diamonds were stolen | Thorndyke agrees to defend Reuben on the assumption of innocence and takes thumb-prints for comparison |
| 3 | Thorndyke begins his investigation by examining thumb-prints under a microscope and visiting Scotland Yard, while Miss Juliet Gibson calls to offer financial support for Reuben's defence and reveals her doubts about Walter Hornby. | Thorndyke seeks to examine the evidence and gather facts; Miss Gibson offers support and information | The thumb-print evidence appears conclusive but Thorndyke maintains an open mind about alternative hypotheses | Thorndyke photographs the evidence at Scotland Yard and learns more about the Hornby family dynamics from Miss Gibson |
| 4 | Jervis visits Miss Gibson to inquire about the Thumbograph and learns from her that Walter Hornby warned her against being seen with Reuben, claiming he had boasted about her romantic interest in him. | Jervis seeks to obtain the Thumbograph and learn more about the Hornby family | Miss Gibson reveals a damaging story about Reuben that Walter told her in confidence | Miss Gibson agrees to bring the Thumbograph to Thorndyke's chambers that evening and confides her doubts about both cousins |
| 5 | Thorndyke examines Jervis's notes on the Hornby family, and that evening Mrs. Hornby and Miss Gibson bring the Thumbograph to his chambers where he photographs it with his copying camera. | Thorndyke seeks to examine the Thumbograph and photograph it for evidence | Mrs. Hornby's rambling conversation threatens to delay the business at hand | Thorndyke successfully photographs the Thumbograph and shows the ladies his laboratory equipment |
| 6 | Jervis reflects on his growing feelings for Juliet Gibson while Thorndyke and barrister Anstey prepare for Reuben's trial hearing, which results in commitment to the Central Criminal Court. | Secure Reuben's release or prepare an adequate defence for trial | The thumb-print evidence appears conclusive and the magistrate commits Reuben for trial despite the defence being reserved | Reuben is committed for trial and remanded to Holloway Prison without bail |
| 7 | Jervis visits Juliet to report Reuben's commitment to Holloway Prison, comforts her distress, and forms a theory that John Hornby himself may be the thief. | Inform Juliet of Reuben's situation and provide reassurance about the defence | Juliet is devastated to learn Reuben is imprisoned and fears for his future; Jervis struggles with his growing love for her | Jervis shares Thorndyke's confidence in Reuben's innocence and arranges to visit Reuben with Juliet the next day |
| 8 | Thorndyke arrives late with injuries from a suspicious accident on London Bridge, then discusses Jervis's theory about John Hornby with measured interest and explains the limitations of finger-print evidence. | Understand the significance of John Hornby's financial troubles to the case and evaluate the reliability of finger-print evidence | Thorndyke's calm reception of Jervis's theory suggests he already knew or has other explanations; the finger-print evidence remains the central obstacle | Thorndyke confirms the theory is tenable and discusses how finger-prints narrow inquiry but do not prove guilt alone |
| 9 | Jervis and Juliet visit Reuben in Holloway Prison, where Jervis observes the degrading conditions and Reuben's cool reception of Juliet's devotion. | Visit Reuben in prison to offer support and gather information | The prison conditions are horrifying and dehumanising; Reuben appears unmoved by Juliet's sacrifice and devotion | Both Jervis and Juliet complete their visits; Jervis becomes convinced Reuben may not reciprocate Juliet's feelings |
| 10 | Thorndyke recovers from his accident and resumes work in the locked laboratory; Jervis accompanies Juliet on a second prison visit and learns crucial details about a blood-stained incident on the day of the robbery. | Support Reuben during imprisonment and gather further information about the crime | Thorndyke's mysterious experiments and the locked laboratory create curiosity; Juliet reveals new evidence about blood-stained papers on the day of the robbery | Jervis learns that Reuben's bloody finger-marks were on papers in John Hornby's study on the day the mines depreciated, shortly before the robbery |
| 11 | Thorndyke and Jervis return late from a suicide case, are ambushed by a cyclist with a poisoned needle projectile, and discover the weapon is a sophisticated air-gun device designed for assassination. | An unknown assailant wants to kill Thorndyke using a concealed weapon | Jervis's presence prevents a close-range shot; the cyclist escapes on a high-geared bicycle | The projectile is recovered and revealed to be a hypodermic needle in a brass cylinder with a lead piston, designed to inject poison on impact |
| 12 | With the trial a week away, Jervis meets Anstey who expresses confidence in acquittal, then encounters Juliet who is distressed by Lawley's pessimism; Jervis comforts her but then withdraws emotionally, causing their growing friendship to collapse. | Jervis wants to reassure Juliet about Reuben's prospects and maintain their friendship | Jervis's duty to Thorndyke's confidentiality conflicts with his desire to comfort Juliet; his emotional restraint pushes her away | Jervis and Juliet grow distant; they part as near-strangers after visiting Reuben in prison |
| 13 | Thorndyke receives a poisoned cigar disguised as a sample from a cigar manufacturer; through meticulous analysis of the packaging and the device itself, he deduces the assailant's social position, knowledge, and mechanical skill, and reveals he has theoretical murder cases in his private journals. | Thorndyke wants to examine and understand the poisoned cigar to identify the assailant | The poison is concealed within the cigar in a sophisticated manner designed to evade detection | Thorndyke dissects the cigar, reveals it contains a white alkaloidal poison deposited via hypodermic syringe, and deduces six key facts about the assailant |
| 14 | On the morning of the trial, Jervis escorts Mrs. Hornby and Juliet to court; he discovers that Walter Hornby typed Mrs. Hornby's evidence on a recently purchased Blickensderfer with the characteristic identifying mark, making him a suspect as the assailant. | Jervis wants to support Mrs. Hornby and Juliet as they prepare for the trial | Jervis discovers evidence suggesting Walter Hornby may be the mysterious assailant X | Jervis takes possession of the typed evidence and realises Walter Hornby matches the profile of the assailant, though he remains uncertain |
| 15 | The trial of Reuben Hornby begins with jury selection and prosecution witnesses establishing the theft and the damning thumb-print evidence. | Prosecution seeks to prove Reuben stole diamonds using the thumb-print as key evidence | The thumb-print appears to match Reuben's left thumb perfectly, yet he claims innocence and has no motive | Prosecution rests after two finger-print experts swear the print is certainly Reuben's |
| 16 | Thorndyke proves the thumb-print is a forgery by demonstrating how to forge finger-prints and revealing the print was made from the Thumbograph; Reuben is acquitted. | Defence must prove the thumb-print is a forgery and Reuben is innocent | The experts are certain the print is genuine; Thorndyke must overturn their testimony with proof | Thorndyke demonstrates forgery is possible, proves the print differs in size, and shows it was copied from the Thumbograph; jury acquits Reuben |
| 17 | After Reuben's acquittal, Jervis walks with Juliet and discovers she was never engaged to Reuben, leading him to confess his love for her in Fountain Court. | Jervis wants to understand his relationship with Juliet now that the case is over and to express his feelings for her. | Jervis has been tormented by the false belief that Juliet was engaged to Reuben, which made him feel he had betrayed his duty by falling in love with her. | Juliet reveals she was never engaged to Reuben and accepts Jervis's love, though she does not explicitly say the words back. |
Setups and payoffs AI
Story and structure · lens A8 · compare across books
| Planted | Pays off | |
|---|---|---|
| Thorndyke's expertise in combining medicine with law and scientific evidence (Ch 1) | Thorndyke's scientific methods prove essential to investigating the thumb-print and exposing the forgery (Ch 16) | |
| The thumb-print has a distinctive scar crossing the ridge pattern (Ch 2) | The scar is revealed to be an S-shaped white mark caused by a loose fibre in the Thumbograph paper (Ch 16) | |
| Walter Hornby is skilled in photography and collotype reproduction (Ch 3) | Walter's mechanical skill enables him to create the wooden finger-print stamps and poisoned devices (Ch 16) | |
| Thorndyke's accident on London Bridge appears possibly intentional (Ch 8) | Walter attempts multiple assassinations using poisoned projectiles and cigars to silence Thorndyke (Ch 13) | |
| Thorndyke orders twenty-four boxwood pieces made but reveals nothing of their purpose (Ch 10) | The boxwood pieces are revealed to be finger-print forgery stamps made from different impressions of Reuben's thumb (Ch 16) | |
| Walter Hornby purchased a Blickensderfer from a literary friend about a week ago (Ch 14) | The typewriter's characteristic mark on the 'e' matches the cigar label, identifying Walter as the assailant (Ch 14) | |
| Jervis's internal conflict between love and professional duty to Thorndyke (Ch 12) | After the case ends, Jervis is free to pursue his love for Juliet without guilt (Ch 17) | |
| Juliet's cryptic reference to someone else who will owe Reuben gratitude (Ch 17) | Jervis learns that Reuben is secretly engaged to another woman, freeing Juliet for Jervis (Ch 17) |
Hippocrates is only hiding under the gown of Solon, as you will understand when I explain my metamorphosis (Ch 1, para 7)
I make it a rule, in all cases, to proceed on the strictly classical lines of inductive inquiry--collect facts, make hypotheses, test them and seek for verification (Ch 3, para 13)
A finger-print is merely a fact--a very important and significant one, I admit--but still a fact, which, like any other fact, requires to be weighed and measured with reference to its evidential value (Ch 3, para 21)
Speech fingerprints Count
Dialogue and voice · lens C3 · compare across books
| Character | Share of attributed speech | Lines | Words a line | Questions per 100 lines | Exclaims per 100 | Pet words |
|---|---|---|---|---|---|---|
| Dr. Thorndyke | 56% | 292 | 17.4 | 17.5 | 8.6 | case, thumb, shall, find, take, quite |
| Juliet Gibson | 16% | 85 | 16.7 | 25.9 | 11.8 | reuben, shall, walter, jervis, thorndyke, aunt |
| Mr. Anstey | 6% | 39 | 13.0 | 28.2 | 0.0 | lord, thumb, hospital, believe, quite, print |
| Mrs. Hornby | 6% | 37 | 13.6 | 8.1 | 16.2 | about, walter, dear, juliet, sure, asked |
| Mr. Lawley | 4% | 13 | 27.9 | 0.0 | 7.7 | thumb, print, paper, hornby, prints, course |
| Mr. Singleton | 4% | 13 | 25.5 | 23.1 | 0.0 | genuine, though, forgery, print, thumb, give |
| Polton | 3% | 27 | 9.3 | 7.4 | 7.4 | wonderful, it's, case, shall, just, doctor |
| Sir Hector Trumpler | 3% | 20 | 11.9 | 40.0 | 5.0 | case, hornby, lord, witness, john, present |
| Reuben Hornby | 3% | 23 | 10.3 | 13.0 | 4.3 | jervis, juliet, matter, take, shall, guilty |
| Walter Hornby | 1% | 8 | 9.9 | 0.0 | 0.0 | affair, jervis, walk, shall, probably, soon |
We give a line to a speaker only when one cast name appears in the narration of that paragraph, so many lines stay unattributed. Treat the figures as a sample.
Sentence length per chapter Count
Pace · lens D2 · compare across books
Mean sentence 18.3 words, median 15. 32% of sentences are under 10 words and 17% over 30. In the last fifth of the book, chapters run at 194% and sentences at 91% of the earlier average.
Emotional arc shape Count
Pace · lens D7 · compare across books
Computed shape: Man in a hole (fall then rise) (fit 0.64 on a scale of 0 to 1).
We score the mood of each paragraph with a standard word list, then average across 20 equal slices of the book and smooth it. It is a rough reading of word mood, not of plot, and old styles of English can fool it. Shapes follow Reagan and others (2016).
When the lead and the first dialogue arrive Count
Openings and endings · lens F3, F4 · compare across books
First line of dialogue: after 3 words (Ch 1, para 2), 0.0% into the book.
The lead, Dr. Jervis, is first named after 241 words (Ch 1, para 4). In a first person book the narrator may be on the page from the first line before we learn the name.
Mystery clue list AI
Genre craft · lens G4 · compare across books
| Clue | Kind | Laid | Explained | |
|---|---|---|---|---|
| The thumb-print has a distinctive scar crossing the ridge pattern | clue | Ch 2 | Ch 16 | |
| Walter Hornby is skilled in photography and collotype reproduction | clue | Ch 3 | Ch 16 | |
| A man deliberately pushed Thorndyke in front of a lorry on London Bridge | clue | Ch 8 | Ch 14 | |
| The cigar label typed on a Blickensderfer literary machine with characteristic asterisk and worn 'e' | clue | Ch 13 | Ch 14 | |
| Walter Hornby purchased a Blickensderfer from a literary friend about a week ago | clue | Ch 14 | Ch 14 | |
| The blood found in the safe is liquid and clear red, not clotted as normal blood would be after hours | clue | Ch 15 | Ch 16 | |
| The thumb-print is one-fortieth of an inch larger than Reuben's genuine print | clue | Ch 16 | Ch 16 | |
| An S-shaped white mark appears in both the Thumbograph print and the red print, caused by a loose fibre in the paper | clue | Ch 16 | Ch 16 |
the thumb-print has been identified as that of Mr. Reuben Hornby (Ch 2, para 20)
our fair visitor conveyed to me the impression that her evident admiration of Reuben's character was tempered by something that she had heard from a third party (Ch 3, para 76)
Reuben is a confounded fool. He has been chattering to the men at the club and seems to have given them the impression that a young lady of means and position has been setting her cap at him very hard (Ch 4, para 90)
Antagonist AI
Character · lens B7 · compare across books
| Who | Walter Hornby |
|---|---|
| Goal | To frame his cousin Reuben for diamond theft to secure his inheritance and financial security. |
| Methods | Forging Reuben's thumb-print using the Thumbograph, creating a fake print with defibrinated blood and wooden stamps, and attempting to assassinate Thorndyke with poisoned projectiles and cigars. |
| Shows their hand | Ch 16 |
| Our note | Walter's guilt is revealed when he flushes and flees the courtroom as Thorndyke exposes the thumb-print forgery. |
Tension curve AI
Pace · lens D6 · compare across books
Tension score per chapter, 1 to 5 (our AI reading). The novel maintains steady tension through the investigation and trial, with intensity building through the assassination attempts and the trial itself. The pace slows in the final chapter to allow for romantic resolution, creating a gentle denouement after the climactic courtroom scene.
Subplot thread map Both
Story and structure · lens A7 · compare across books
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reuben's defence and trial | |||||||||||||||||
| Jervis and Juliet's romance | |||||||||||||||||
| Assassination attempts on Thorndyke | |||||||||||||||||
| Thorndyke's investigation and scientific methods | |||||||||||||||||
| Walter Hornby's guilt and exposure | |||||||||||||||||
| The thumb-print evidence and forgery |
- Reuben's defence and trial: The central plot following Reuben's arrest for diamond theft through his acquittal via Thorndyke's exposure of the forged thumb-print.
- Jervis and Juliet's romance: Jervis's growing love for Juliet, complicated by his duty to the case and his confusion about her relationship with Reuben, resolved when he learns she was never engaged to Reuben.
- Assassination attempts on Thorndyke: Walter's escalating attempts to kill Thorndyke using a poisoned needle projectile, a poisoned cigar, and other ingenious devices to prevent him from exposing the forgery.
- Thorndyke's investigation and scientific methods: Thorndyke's systematic use of microscopy, magnification, photography, and deductive reasoning to uncover the truth about the forged thumb-print.
- Walter Hornby's guilt and exposure: Gradual revelation of Walter's financial desperation, mechanical skill, and involvement in the theft and forgery, culminating in his exposure and flight from court.
- The thumb-print evidence and forgery: The central mystery of how a thumb-print was forged using the Thumbograph, wooden stamps, and defibrinated blood to frame Reuben.
Motif tracker AI
Theme and motif · lens J3 · compare across books
- Magnification and hidden details (Ch 3, 5, 10, 13, 16): Scientific examination reveals truths invisible to casual observation, whether through microscopes, magnifying glasses, or careful deduction.
- Finger-prints and identity (Ch 2, 3, 5, 6, 8, 10, 15, 16): Finger-prints serve as both evidence of guilt and proof of innocence, central to the novel's exploration of scientific proof versus circumstantial evidence.
- Ingenious mechanical devices (Ch 11, 13): Walter's sophisticated air-gun, poisoned cigar, and finger-print stamps demonstrate how mechanical skill can be perverted to criminal ends.
- Blood and evidence (Ch 2, 7, 10, 15, 16): Blood serves as both incriminating evidence and the key to exposing the forgery, representing the physical traces that reveal truth.
- Duty versus love (Ch 6, 7, 12, 17): Jervis struggles between his professional obligation to Thorndyke and his personal desire for happiness with Juliet, ultimately finding both.
- The Temple as sanctuary (Ch 1, 5, 17): The Middle Temple and Fountain Court represent spaces of law, justice, and personal refuge where truth is pursued and love is declared.
The innocent man is a negligible quantity, and no arrangements are made for him or his visitors (Ch 9, para 17)
the habit of allowing nothing to pass without a certain amount of conscious attention (Ch 13, para 7)
Signature words Count
Prose style · lens H3 · compare across books
Words this book uses far more than the other books on our shelf (log odds, at least 8 uses). Names often top the list.
Commercial facts card Research
Commercial facts · lens L1, L2, L4 · compare across books
| First published | 1907 |
|---|---|
| Author died | 1943 |
| Copyright | Public domain in the UK (author died 1943, so life plus 70 years has passed) and in the US (first published 1907, before 1931). |
| Length | 70,853 words in 17 chapters; about 4.7 hours to read |
| Genre | Crime and mystery |
| Sales and adaptations | Coming in a later phase, with sources. |
Method: counts come from a clean public domain plain text, split into chapters and paragraphs with stable IDs (for example c3p12 is chapter 3, paragraph 12, in reading order). Lenses marked AI are our AI reading of each chapter, made once and stored. Every quote shown was checked word for word against the text; 29 AI quotes for this book failed that check and were dropped.
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