On a rainy night, eccentric tramp Mr. La Souris finds a corpse. But the body soon vanishes in his car leaving only his wallet. While the police start investigating a missing person report, La Souris concocts a plan to secure his find.

Traumatised by a serious accident, truck driver Georges Moreau knows that he must avoid strong emotions and any kind of stress. Recently wed, he hopes to start anew by opening a restaurant on the National 7 highway, although he's none too pleased when the truckers start flirting with his lovely wife. Opposite the restaurant is a petrol station owned by Pieri, whom Georges begins to suspect of having an affair with his wife. Doubtful of her fidelity, Georges realises that he's heading for a nervous breakdown.

1946 film directed by Georges Lacombe

Paris, France. Commissaire Wens is put in charge of the investigation into the murder of one of six friends who, in the past, made a very profitable promise.