Monsieur Lecoq

Real Name

Monsieur Lecoq

First Appearance

L'Affaire Lerouge (The Lerouge Affair, 1866)

Original Publisher

Created by

Émile Gaboriau


Monsieur Lecoq was an agent of the Sureté (the French equivalent of Scotland Yard). He was a brilliant detective, capable of making incredible deductions from the smallest of clues. He was methodical and scientific, a student of the methods of Tabaret, a retired master detective who sometimes aided Lecoq from the comfort of his bed.

Monsieur Lecoq had a daughter and son named Lucien, who also became a police officer. After he retired from the police, he lived under the name Muret, until he was murdered in the Batignolles. His last words were "Three, the Three!" Lecoq's daughter was able to solve the murder, using her father's hidden memoirs.

Public Domain Literary Appearances

  • L’Affaire Lerouge (1866) -The Lerouge Case
  • Le Crime d’Orcival (1867) -The Mystery of Orcival, Crime at Orcival
  • Le Dossier No. 113 (1867) -File No. 113, Dossier No. 113, The Blackmailers
  • Les Esclaves des Paris (1868) -The Slaves of Paris
  • Monsieur Lecoq (1869)
  • “Une Disparition” in Le Petite Vieux des Batingoles (1876) -“A Disappearance” in The Little Old Man of Batignoles
  • Le Vieillesse de Monsieur Lecoq (1878) by Fortune du Boisgobey -The Old Age of Monsieur Lecoq
  • La Fille de M. Lecoq (1886) by & William Busnach & Henri Chabrillat - The Daughter of Monsieur Lecoq
  • File No. 114: A Sequel to File No. 113 (1886) by Ernest A. Young (written in English)

Public Domain Film Appearances

  • Monsieur Lecoq (1914)
  • Monsieur Lecoq (1915)
  • The Family Stain (1915)


  • The name Lecoq means "The Rooster."
  • In the first Sherlock Holmes story, A Study in Scarlet (1887), Dr. Watson compares Holmes to Monsieur Lecoq, which Holmes shows disgust towards, remarking: "Lecoq was a miserable bungler. He had only one thing to recommend him, and that was his energy. That book made me positively ill. The question was how to identify an unknown prisoner. I could have done it in twenty-four hours. Lecoq took six months or so. It might be made a text-book for detectives to teach them what to avoid."

See Also

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