Don Luis Perenna

Florence Levasseur

Don Luis is deeply in love with Florence, though their relationship is complicated by secrets and danger.

Sergeant Mazeroux

Mazeroux is Don Luis's loyal friend and ally, often assisting him in investigations.

M. Desmalions

M. Desmalions, the Prefect of Police, works with Don Luis as a trusted consultant on criminal cases.

Deputy Chief Weber

Weber is suspicious of Don Luis and often competes with him, viewing him as a potential criminal.

Gaston Sauverand

Don Luis and Sauverand are adversaries, with Sauverand involved in criminal schemes against Don Luis.

Hippolyte Fauville

Hippolyte Fauville is a murder victim whose death Don Luis investigates, making him a key figure in the mystery.

Marie Fauville

Don Luis protects and sympathizes with Marie Fauville, the widow of the murdered scientist.

Armande Roussel

Armande Roussel is a loyal ally and assistant to Don Luis, helping him in his investigations.

Valenglay

Valenglay is a powerful political ally and friend who supports Don Luis's secret operations.

M. Desmalions

M. Desmalions, the Prefect of Police, works with Don Luis as a trusted consultant on criminal cases.

Florence Levasseur

Don Luis is deeply in love with Florence, though their relationship is complicated by secrets and danger.

Deputy Chief Weber

Weber is suspicious of Don Luis and often competes with him, viewing him as a potential criminal.

I: d’Artagnan, Porthos… and Monte Cristo

Present at the reading of Cosmo Mornington's will; his identity is verified by the Peruvian attaché and Major Comte d'Astrignac; he is the executor and conditional legatee.

A Man Dead

Reveals himself as Arsène Lupin to Mazeroux; investigates the Mornington will and deduces a plot against the Fauvilles.

A Man Doomed

Discovers the double murder, swears vengeance, and realizes he is framed.

IV: The Clouded Turquoise

Detained and questioned by the Prefect; suspected due to his presence in the house during the murders.

V: The Iron Curtain

Receives a phone call from Mazeroux about the arrest operation and Marie Fauville's suicide attempt; is trapped by a falling iron curtain; later reads newspapers with Mlle. Levasseur.

The Man with the Ebony Walking-Stick

Receives the Prefect of Police in his study; is confronted with the incriminating walking-stick half but negotiates a compact to remain free and assist the police.

Shakespeare’s Works, Volume VIII

Discovers the hidden compartment in the Shakespeare volume and suspects Florence of theft and complicity; later keeps watch at the Fauville house.

VIII: The Devil's Post-Office

The central figure, credited with saving the Prefect of Police and receiving Fauville's letter; he suspects Florence and investigates the case.

IX: Lupin’s Anger

Pursues Sauverand and Florence, vows to defend Marie Fauville, and struggles with jealousy and rage.

X: Gaston Sauverand Explains

Struggles with his hatred for Sauverand and his lingering passion for Florence; listens to Sauverand's plea and explanation.

XI: Routed

Tries to outwit Deputy Chief Weber by claiming he has captured Florence and Sauverand, but is ultimately outmaneuvered; discovers the secret passage used by the fugitives.

XII: “Help!”

Narrates his deductive process, becomes convinced of Sauverand and Marie Fauville's innocence, and discovers the true criminal's identity; trapped in the underground passage, he cries for help as the explosion approaches.

XIII: The Explosion

Survives the explosion by digging a tunnel to a telephone, warns the police, and later emerges determined to prove the innocence of Marie Fauville and Sauverand.

XIV: The "Hater"

Reveals the truth about Fauville's plot, explaining the logic behind the letters and the sealed envelope.

XV: The Heir to the Hundred Millions

Remains calm despite Mazeroux's warnings and the mounting suspicion against him; later argues that the inheritance was not Fauville's motive.

XVI: Weber Takes His Revenge

Defends Florence, is arrested by Weber, reveals his identity as Arsène Lupin.

XVII: Open Sesame!

Imprisoned as Arsène Lupin, he negotiates with Valenglay for temporary freedom to save Florence.

Arsène I Emperor of Mauretania

Reveals his identity as Arsène Lupin and his conquest of Mauretania; offers the empire to France for freedom to rescue Florence Levasseur.

The Snare Is Laid. Beware, Lupin!

Pursues Florence after her abduction, interrogates the taxi driver, deduces the villain's route, and tracks her to Damigni.

XX: Florence's Secret

Saves Florence's life, confronts her about her hostility, and learns of her secret love for him.

Lupin's Lupins

Retired to Saint-Maclou, cultivates lupins, helps the unfortunate, and defends Arsène Lupin's legacy. Later arrives at Valenglay's office precisely on time, having captured Jean Vernocq.