Paul Meurisse

Stanilas Octave Seminario aka 'SOS', détective

Micheline Francey

Muriel Pescara, the daughter

Gilbert Gil

Charles Pescara, the son

Pierre Renoir

Doctor Gérard Pescara, the father

Jean Tissier

Guillaume

Pierre-Louis

Paul Wantz

Junie Astor

Hélène Tassin, nurse

Jean Debucourt

Doctor Vermeulen

Jean Brochard

Investigating judge