After a New Year's Eve party, 30-year-old fashion designer Rebecca (Nathalie Schmidt) awakens alone in a strange automobile. Later, during a routine visit to her gynecologist, she learns that she's pregnant. Unable to recall anyone responsible, she attempts to find the father as she treks through Paris streets, quizzes her girlfriends, and visits a Belgian detective. With few leads, her search drags on for months.

Quelque temps apres un reveillon de la Saint-Sylvestre, Rececca decouvre qu'elle est enceinte. Qui peut bien etre le pere? Rebecca ne garde qu'un souvenir vaguede cette soiree bien arrosee. Les copine de Rebecca se reunissent en conseil de crise et decident alors de mener leur propre enquete.