Having his job as a tweed tailor, Alex Ponttin has devised a novel way to keep himself in touch with society. He admits himself into people’s homes, by pretending to be a relative or an official, and persuading his victims to give him a night’s free board. With his disarming, amiable personality, he is rarely refused. So he visits the vulgar Dumont, the nymphomaniac Marie Wileska and he stays at the shy lesbian Caroline Winberg. Alex helps Caroline in conflicts with her quarrelsome girl-friend Gloria and he rescues Caroline’s inheritance. The homeless Alex is chased by Commissaire Bruneau. Fortunately, the police officers investigating the case are so terminally stupid that Alex has little chance of being arrested…