Honoré, a valet, has an extremely logical mind and is unable to tell a lie. This comes in very fortunate for the family he works for.

A detective, fresh out of the academy (lowest mark in class), gets the assignment to bodyguard a spoiled rich girl reporter. She's been interviewed on TV and has questioned the virility of a mobster who kidnaps her later.

Alain Brécourt, a former pilot who distinguished himself during the war, meets Françoise Clozat, a test pilot. They become lovers, but Françoise learns that Alain is married to a singer. Françoise despairs, but Alain proves to her that he has been living away from his wife for some time. She meets the singer, no longer believes Alain, and attempts suicide during a flight. Her instinct for self-preservation saves her. Alain is the first to turn his attention to her: when she opens her eyes again, she receives the assurance of his love.