Dick Martin

Mr. Havelock

Dick Martin is a detective working closely with Mr. Havelock, likely his superior or key ally in the investigation.

Inspector Sneed

Dick Martin and Inspector Sneed are colleagues in law enforcement, collaborating on the case.

Sybil Lansdown

Dick Martin and Sybil Lansdown share a romantic connection, with Martin acting as her protector and love interest.

Lord Selford

Dick Martin and Lord Selford are adversaries, with Martin investigating Selford's suspicious activities.

Lew Pheeney

Dick Martin interacts with Lew Pheeney as part of his detective work, likely as an informant or suspect.

Antonio Stalletti

Antonio Stalletti is a criminal adversary of Dick Martin, opposing him in the investigation.

Mrs. Bertram Cody

Dick Martin questions Mrs. Bertram Cody as a witness or person of interest in the case.

Thomas Cawler

Dick Martin deals with Thomas Cawler as a suspect or associate in the criminal underworld.

Bertram Cody

Bertram Cody interacts with Dick Martin as a concerned parent and potential ally in the investigation.

John Pierce

Dick Martin works with John Pierce as a fellow investigator or assistant.

Slick

Dick Martin uses Slick as an informant or underworld contact in his detective work.

Lord Selford

Dick Martin and Lord Selford are adversaries, with Martin investigating Selford's suspicious activities.

The Door with Seven Locks

Investigates the door with seven locks and uncovers the secret passage.

I

A skilled detective leaving Scotland Yard after inheriting money; reflects on his unusual upbringing in a prison and his final arrest of Lew Pheeney.

II

Sub-Inspector from Scotland Yard investigating the book theft; displays a confident, teasing demeanor and is leaving the police force soon.

III

Visits Dr. Stalletti's cottage to retrieve a book and encounters Tommy Cawler; later meets with Lew Pheeney who confesses his tomb-robbing job.

IV

Accepts the assignment to find Lord Selford; later finds Lew Pheeney dead in his flat.

V

Hosts the police investigation in his dining-room; discovers Lew Pheeney's body; later meets with Mr. Havelock and departs England.

VI

Returns from his global quest, meets Sybil Lansdown on the ship, and protects her from thieves at Waterloo Station.

VII

Reports to Havelock about trailing Pierce; discovers blotting-paper clue linking Pierce to Cody.

VIII

Disguised as John Rendle, he visits Cody to gather information and successfully steals Cody's notebook and key.

IX

Drives to Cody's, finds a key, and later fights a naked assailant at Stalletti's house.

Chapter X

Referred to as 'Martini' or 'Martin' by Stalletti; identified as the man Havelock sent to find Selford.

XI

Visits Mr. Havelock to confess about the blotting-paper and shows him the key and pocketbook taken from Stalletti; decides to go into hiding and keep his plans secret.

XII

Visits the Lansdowns, reveals he kept the key and is now a private detective, warns them to be prepared to leave London.

XIII

Visits Inspector Sneed, shares his discoveries, and later survives an attack in his flat by a mysterious assailant.

XIV

Wakes to Sybil's call, retrieves keys, drives to Selford Hall, and examines the tomb.

XV

Fires at a mysterious figure, discovers chlorine gas cylinders, examines the door with seven locks, and later meets with Inspector Sneed to discuss the case.

XVI

Accompanies Sneed on the raid, waits in his car and follows the police to Gallows Cottage.

XVII

Discusses the letter from Cairo with Havelock, declines a trip to Damascus, and admits he cannot pick the seven locks.

XX

Driven by personal feelings for Sybil, he investigates her disappearance and receives a murder call, leading him to Weald House.

XXI

Discovers Mrs. Cody's body and the duplicate key; finds Bertram Cody murdered; tracks bloody footprints and finds Sybil's handkerchief.

XXII

Investigates the room with Sneed, climbs onto the roof, descends the ladder, and leads the crawl toward the assailant.

XXIII

Survives an assassination attempt and leads the investigation, discovering key documents.

XXV

Arrives at the end of the chapter, providing relief to Sybil.

XXVI

Investigates the grounds for signs of Tom Cawler, finds evidence of a struggle but no body; discovers a walking stick in the chimney, suggesting an intruder; agrees to stay at the Manor for safety.

XXVII

Retrieves his car, drives to Selford, and discusses the keys and Stalletti's involvement with Sneed.

XXVIII

Confesses his personal interest in Sybil's safety; inspects the state room and cellars, discovering suspicious beer barrels; reveals Sybil's status as heiress.

XXIX

Leads the stakeout, witnesses the giants' emergence, pursues them through the wood, and chases Stalletti's car to the quarry.

The Arrest and the Fire

Confronts Havelock, reveals the truth about the Selford chase, and rescues Tom Cawler from the lake.

XXXI

Leads the retrieval of the seven keys and opens the tomb, discovering Cody's confession.

XXXIII

Reveals Havelock's forgery, reflects on Sybil's new wealth, and visits her at Coram Street.