In Paris, on the eve of her 35th birthday, Claire Dostes (Michèle Laroque) decides to invite her three boy-friends Sacha Peters (Antoine Basler), Charles Thiriot (Michel Vuillermoz) and Prince Hakim (Zinedine Soualem) and her best friend Ruitchi (Gilles Privat) to a dinner party, with the objective of helping her to decide who would be her future husband. Meanwhile, the police detective Eric Cellier (Albert Dupontel) is chasing two small time thieves that are heisting the apartments in her neighborhood. Along the night, Claire accidentally kills her four guests. When she calls her sister Alice (Elise Tielrooy) to help her, she brings dozen of friends for a surprise birthday party. Soon she receives also the two burglars and the policemen under the command of Cellier. And the night has not finished yet.