M. Boirac

Mr. Georges La Touche

M. Boirac and Georges La Touche are bitter enemies, with La Touche suspected of having an affair with Boirac's wife.

Mr. Felix

M. Boirac and Mr. Felix are locked in a tense conflict over business and personal grievances, with Felix suspected of murder.

M. Lefarge

M. Boirac and M. Lefarge are business associates or colleagues, with Lefarge possibly involved in Boirac's schemes.

Inspector Burnley

Inspector Burnley investigates M. Boirac as a prime suspect in the murder of Mr. Felix.

Henri François

Henri François is a servant or employee of M. Boirac, carrying out his orders.

Pierre Bonchose

Pierre Bonchose is a business associate or underling of M. Boirac, involved in his affairs.

M. Lefarge

M. Boirac and M. Lefarge are business associates or colleagues, with Lefarge possibly involved in Boirac's schemes.

Mr. Georges La Touche

M. Boirac and Georges La Touche are bitter enemies, with La Touche suspected of having an affair with Boirac's wife.

Inspector Burnley

Inspector Burnley investigates M. Boirac as a prime suspect in the murder of Mr. Felix.

Mr. Felix

M. Boirac and Mr. Felix are locked in a tense conflict over business and personal grievances, with Felix suspected of murder.

Mr. Felix

M. Boirac and Mr. Felix are locked in a tense conflict over business and personal grievances, with Felix suspected of murder.

M. Lefarge

M. Boirac and M. Lefarge are business associates or colleagues, with Lefarge possibly involved in Boirac's schemes.

Part II: Paris

Makes a statement and is involved in the Paris investigation.

XIII: The Owner of the Dress

Identifies his wife's dress and photograph, learns of her murder by strangulation.

XIV: M. Boirac Makes a Statement

Provides a detailed statement about his wife's disappearance, describing his actions on the night of the dinner party and his discovery of her farewell letter.

XV: The House in the Avenue de l'Alma

Returns home during the investigation; identified Madame's body earlier and is questioned about the marble group.

Inspector Burnley Up Against It

Husband of the missing Madame; considered a suspect due to possible jealousy; his statement about his whereabouts is corroborated.

A Council of War

Considered as a suspect with a potential motive of jealousy; his alibi is questioned, especially the part about the American.

XVIII: Lefarge Hunts Alone

Provides a detailed alibi for his whereabouts on Monday through Wednesday; returns from London and meets with Lefarge.

XIX: The Testing of an Alibi

The subject of the alibi investigation; his statement is tested and found true.

Part III: London and Paris

Becomes a prime suspect after his wife Annette is identified as the victim.

Mr. Georges La Touche

Considered the prime alternative suspect; Clifford and Heppenstall theorize he murdered his wife and framed Felix.

Disappointment

The pump manufacturer whose alibi is under scrutiny; all witnesses confirm his telephone calls and presence at Charenton.

A Clue at Last

Suspected of replacing the typewriter and dismissing the typist to conceal evidence.

XXVII: La Touche’s Dilemma

Observed by La Touche; scar on his hand confirmed; alibi broken by establishing his presence at Charenton café on March 29.

XXVIII: The Unravelling of the Web

Revealed as the murderer; killed his wife and used the cask to dispose of the body.

A Dramatic Dénouement

Confesses to the murder and framing of Felix, then escapes by locking La Touche and Mallet in the room.

XXX: Conclusion

Sets his house on fire to destroy evidence, attempts to escape, and commits suicide when cornered.