In a run-down hotel, only one room with two double beds is still available. The head porter, a former foreign legionnaire, and the shady hotel manager have double-booked this one room. First to an exhausted couple and then to a sales representative who is expecting his mistress, a dancer. But on this very day, his wife visits him as a birthday surprise. So now there are two couples and a dancer in one room, and even the pull-out folding screen is no solution. Everyone discovers a stranger, half-dressed, almost dressed, in the bathroom, in the beds, in the room.