During a walk along the cliffs not far from Marseille, Elisa Langerot sees her husband slip and fall to his death. Inexplicably, Elisa flees the scene of the accident, stops a passing driver and tells him a made-up story about a stolen car, concealing her husband's death. Feeling sorry for the girl, the driver, Philippe Morçot, gives her a lift and later lets her stay at his house. The good deed, however, doesn't go unpunished, and soon Philippe is drawn into Elisa's twilight world of fantasies, lies and paranoia.

One Christmas Eve, a carefree young man, Eric, arrives in a small provincial town. Here, he meets Julien, a bar pianist who is his exact double. Julien is in love with Marinette, a pretty waitress, but he is too shy to make any romantic overtures. Eric decides to give the course of true love a helping hand by pretending to be Julien. Meanwhile, Eric’s fabulously wealthy uncle has sent his minions out to bring him back home, so that he may celebrate Christmas in the bosom of his family.

1967 film by Léo Joannon