Each week, Pierre and his friends organize what is called as "un dîner de cons". Everyone brings the dumbest guy he could find as a guest. Pierre thinks his champ -François Pignon- will steal the show.

Looking for a baby-sitter for the night, Marc Schaudel entrusts his son Remy to the care of his employee Franck, a straight man. But the thing that Marc doesn't know, is that Franck is getting 30 years old this weekend and that his son Remy is a very capricious child. The next day, Marc and his wife Claire are awakened by a call from the police. Remy and Franck are missing, and the house is totally devastated. The police finds a camera in the leftovers. Marc, Claire and the police start watching the video that has been recorded the day before during the night and find out what happened to Franck and Remy. Written by Valerie.H