An ad executive impersonates an archeology professor to avoid a situation with an obsessed former lover. She enlists the help of a hapless archeologist who is at the airport to pick the real archeology professor. What follows is a series of conflicting and comical situations involving the "switcheroo."
Prof. Henri Laborit uses the stories of the lives of three people to discuss behaviorist theories of survival, combat, rewards and punishment, and anxiety. René is a technical manager at a textile factory and must face the anxiety caused by corporate downsizing. Janine is a self-educated actress/stylist who learns that the wife of her lover is dying and must decide to let them reunite. Jean is a controversial career-climbing writer/politician at a crossroads in life.
Victor Valance a quitté Paris depuis plusieurs années, laissant derrière lui sa mère et ses trois filles, pour réaliser de sombres opérations de casinos aux Bahamas et au Canada. Sa fille ainée, Pauline, est polytechnicienne, attachée au ministre des finances, et s'occupe de toute la petite famille.