The story of a troubled relationship festering between two couples : young Alain Getty, a home automation engineer, and his wife, sweet Bénédicte ; and middle-aged André, Alain's boss, who is married to the mysterious Alice. Their encounter does not leave the young couple's harmony unscathed. The discovery of a mysterious rodent's corpse blocking the waste pipe of their kitchen sink does nothing to help and portends the bursting of irrationality...