The banker René Duchêne, alias Georges Baudin known as “Monsieur”

Edmond Bernadac, industrialist

Suzanne, former maid of "Monsieur"

Mrs. Elisabeth Bernadac

Mrs. Bernadac, Edmond's mother

“Monsieur”’s mother-in-law

“Monsieur”’s father-in-law

Antoine, small-time crook

José, small-time crook

Private detective