Paul Meurisse
Role: Stanilas Octave Seminario aka 'SOS', détective
Micheline Francey
Role: Muriel Pescara, the daughter
Gilbert Gil
Role: Charles Pescara, the son
Pierre Renoir
Role: Doctor Gérard Pescara, the father
Jean Tissier
Role: Guillaume
Pierre-Louis
Role: Paul Wantz
Junie Astor
Role: Hélène Tassin, nurse
Jean Debucourt
Role: Doctor Vermeulen
Jean Brochard
Role: Investigating judge
Mady Berry
Role: Brigitte Tassin
Pierre Palau
Role: Doorman
Arthur Devère
Role: Lock keeper
Marcel Pérès
Role: Road mender
Georges Bever
Role: Baptiste, clerk
Madeleine Suffel
Role: Hotel boss
Michel Seldow
Role: Illusionist Pablo
Marc Arian
Role: (uncredited)
Léon Arvel
Role: (uncredited)
Alfred Baillou
Role: Man (uncredited)
Rivers Cadet
Role: (uncredited)
Marcel Charvey
Role: (uncredited)
Raymond Destac
Role: (uncredited)
Pierre Duncan
Role: (uncredited)
Cécile Eddy
Role: (uncredited)
Henry Gerrar
Role: Concierge (uncredited)
Claire Gérard
Role: Concierge (uncredited)
Colette Mareuil
Role: (uncredited)
Pierre Moncorbier
Role: (uncredited)
Geneviève Morel
Role: Pescara cook (uncredited)
Henri Niel
Role: (uncredited)
Julienne Paroli
Role: Gossip (uncredited)
Marcelle Rexiane
Role: Director (uncredited)
Maurice Salabert
Role: (uncredited)
Germaine Stainval
Role: Gossip (uncredited)
Jean-Marc Tennberg
Role: Agent on duty (uncredited)
Georgette Tissier
Role: Telephone operator (uncredited)