Having first lost his wife then 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: He finds at first a lunch at the horrible couple Dumont, where a thief follows him for a robbery. Alex spent an evening in front of TV at Marie, mother of seven children. He runs from Marie to find an evening and a new bed at the home of charming but shy lesbian Caroline and her funny lover Gloria. To save her inheritance, Caroline - accused for her homosexuality by her horrible sister Catherine - tells her aunt Amélie, that Gloria is her secretary and Alex her lover. So Alex has to present himself nude in Caroline's bed. He saves Carolines inheritance. The police officers investigating the case are so terminally stupid that Alex has little chance of being arrested.

Alex Pontin, chef tailleur dans un magasin anglais des grands boulevards parisiens, a été licencié il y a un an. À cause de ce revers de fortune, Alex n'a plus de domicile fixe. Aussi décide-t-il de chercher un nouveau lieu pour dormir chaque soir, afin de rompre sa solitude. Il se présente ainsi tour à tour chez quelques parisiens. Alex rencontre la charmante Caroline Winberg, une lesbienne honteuse qui est amoureuse de Gloria, une gentille bourgeoise. Alex s'installe chez Caroline, dont il sauve l'héritage : quand la sœur vertueuse de Caroline, Catherine, arrive avec sa tante Amélie , Alex se balade tout nu pour faire croire qu'il est l'amant de Caroline. Mais le commissaire Bruneau le soupçonne des vols et le talonne pour le prendre en flagrant délit...