The Hotel du Nord is a family-run hotel on the edge of the Canal Saint-Martin in Paris. As the family is celebrating a first communion, a young couple checks in, planning a double suicide. Only one shot is fired, and the man, Pierre (Jean-Pierre Aumont), flees leaving his lover, Renee (Annabella), to die in the room. But, he leaves the gun behind and she survives. A series of convoluted affairs between hotel patrons and staff, as well as passion-fuelled travels across France, ensue - all to end the story in perfect symmetry.