The story starts simply enough: a man misses his train in a small provincial town and needs to find a hotel. He meets a woman in a bar and asks her for help — and to take a walk with her. Romance seems inevitable, but a missed assignation in Paris sends the would-be lovers on their separate ways despite the clearly special connection between them.
Marc (Benoît Poelvoorde) returns to his life in the tax office, Sylvie (Charlotte Gainsbourg, also appearing at the Festival in Samba) moves to the States. Then, one day, Marc meets Sophie (Chiara Mastroianni). They are soon deeply in love, living together, and planning to marry. The hitch: unbeknownst to our hero, Sylvie and Sophie are sisters, and very close ones at that.