Young boxer Michel Maudet is sacked by his manager after a series of match defeats and is forced to look for a new job. He is engaged as secretary to a millionaire named Ferchaux who is in a hurry to flee the country when he discovers he has been implicated in a high-profile fraud.

Jean-Paul Belmondo
as Michel Maudet

Charles Vanel
as Dieudonné Ferchaux

Michèle Mercier
as Lou

Stefania Sandrelli
as Angie, Hitch-Hiker

Malvina Silberberg
as Lina

Barbara Sommers
as Lou's friend

E.F. Medard
as Suska

Todd Martin
as Jeff

André Certes
as Émile Ferchaux

Andrex
as M. Andrei