A medical doctor gets into trouble when one of his patients turns out have been involved in espionage (maybe).

Robert Avranche, a middle-aged, alcoholic garage owner, is sitting on a train, reflecting on the emptiness of his life. An attractive young woman, Donatienne, suddenly enters the compartment and offers to make love to him. Robert accepts but, when the woman leaves the train afterwards, he decides to follow her...

Solange is seriously depressed, and her kindhearted husband, Raoul, makes it his mission to cure her doldrums. After many failed attempts to cheer her up, Raoul hits upon a possible solution: find his wife a lover. Unfortunately, his choice, Stéphane, proves to be just as ineffectual in restoring her flagging spirits. In the end, the gorgeous Solange finds her own, highly problematic tonic to her troubles in the form of a 13-year-old boy.