Alexis Daubrecq

Arsène Lupin

Lupin and Daubrecq are locked in a fierce battle of wits over the crystal stopper, with Daubrecq holding a dangerous secret over Lupin.

Clarisse Mergy

Daubrecq manipulates and torments Clarisse, using her love for her son as leverage to control her actions.

Prasville

Daubrecq and Prasville are antagonists in a political and criminal power struggle, each trying to outmaneuver the other.

D'Albufex

Daubrecq and D'Albufex are political allies and co-conspirators, though their partnership is fraught with mutual distrust.

Gilbert

Daubrecq holds Gilbert's life in his hands, using the threat of execution to manipulate both Gilbert and his mother.

Sébastiani

Sébastiani is an associate of Daubrecq, involved in the criminal and political machinations surrounding the crystal stopper.

Arsène Lupin

Lupin and Daubrecq are locked in a fierce battle of wits over the crystal stopper, with Daubrecq holding a dangerous secret over Lupin.

Clarisse Mergy

Daubrecq manipulates and torments Clarisse, using her love for her son as leverage to control her actions.

D'Albufex

Daubrecq and D'Albufex are political allies and co-conspirators, though their partnership is fraught with mutual distrust.

Prasville

Daubrecq and Prasville are antagonists in a political and criminal power struggle, each trying to outmaneuver the other.

Sébastiani

Sébastiani is an associate of Daubrecq, involved in the criminal and political machinations surrounding the crystal stopper.

Arsène Lupin

Lupin and Daubrecq are locked in a fierce battle of wits over the crystal stopper, with Daubrecq holding a dangerous secret over Lupin.

II: Eight from Nine Leaves One

Deputy under surveillance; Lupin spies on him and is detected.

The Home Life of Alexis Daubrecq

The deputy whose home is searched by Lupin and Victoire; he is the target of the woman's assassination attempt and later interrupts Lupin's conversation with her at the theater.

IV: The Chief of the Enemies

Target of Lupin's investigation; leaves the stopper in a drawer despite being spied upon.

V: The Twenty-Seven

Revealed as the thief of the list of the Twenty-Seven, blackmailer of Victorien Mergy, and kidnapper of Jacques. His passion for Clarisse is noted.

VI: The Death-Sentence

Daubrecq sees through Lupin's disguise, refuses to release the boy, and taunts Lupin, showing his confidence and control.

VII: The Profile of Napoleon

Kidnapped from his home by four masked men; his study shows signs of struggle.

VIII: The Lovers’ Tower

Daubrecq is tortured by d'Albufex and Sébastiani, eventually reveals the hiding place of the crystal stopper.

IX: In the Dark

Escapes from Mortepierre; intercepts Clarisse's letter at the Hôtel Franklin and cuts out key words.

X: Extra-Dry?

Catches Clarisse in his room, attempts to blackmail her, and is chloroformed by Lupin.

The Cross of Lorraine

Daubrecq is drugged with chloroform and placed in a trunk by Lupin and his accomplices for transport.

The Last Battle

His glass eye is revealed to contain the genuine list of the Twenty-Seven; he is brought to Lupin in a trunk.