In 1910 Paris, France, Marcelle Cot becomes so annoyed with her neglectful husband Henri, a pompous architect, that she consents to a rendezvous with her timorous neighbor, Benedict Boniface, who has learned his domineering wife Angélique is spending the night with her ailing sister. After dining at a café, Marcelle and Benedict adjourn to the Hotel Paradiso, which is also being used as a place of assignation by Monsieur Cot's nephew, Maxime, and Benedict's flirtatious maid, Victoire. Panic sets in for Marcelle and Benedict when additional arrivals include a barrister friend of Benedict's and Monsieur Cot himself, who has come to inspect the plumbing. In a series of frantic attempts to conceal their identities, Marcelle and Benedict concoct elaborate stories, flee from bedrooms to bathrooms, hide in chimneys and don disguises. The mayhem subsides when the hotel premises are raided by the police. On the next day, however, the nearsighted police inspector is unable to identify anyone; and when Maxime and Victoire openly admit to their presence in the hotel, they are assumed to be the night's revelers and the affair is dropped. Peace is restored until both the Cot and Boniface households are invited to attend the opening of the new romantic play by Georges Feydeau, who also stayed at the hotel on the eventful night. Although the two principal stage characters are heavily made up and their acting larger than life, there is little doubt that they bear a remarkable resemblance to Marcelle and Benedict.