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

Nathalie Bernadac, daughter of Edmond

Maître Flamand, notary, friend of “Monsieur”

Michel Corbeiln, writer

Alain Bernadac, son of Edmond

Justine, Bernadacs' cook

Marc, small-time crook

Mrs. Danoni

Shipowner Danoni, guest of the Bernadacs

"Monsieur's" manservant

Boss of the bistro