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In a palace in Nice, a modest valet is confused with his master, a viscount chased by a man-eater.
A bungling thief is threatened by one target with blackmail, unless the thief will kill his own cousin, a wealthy eccentric who is considered the village idiot.
Hector and Odette Dupuis' car breaks down in the middle of nowhere, but not far from a luxury hotel. The couple are well off but, being miserly, Odette is determined to keep her budget tight. Fortunately for her, the hotel offers rooms for domestics costing only 35 francs, so she decides to pass her husband as her chauffeur. As far as she is concerned, Odette presents herself as Baroness de Garches and takes a 250 franc room. But their stay soon becomes complicated. For instance, Palureau, a widower with five daughters who is planning to remarry, starts courting the 'baroness'. And that is not all since at the same time Angèle, a chambermaid, makes advances to Hector ! To make matters worse, Ferdinand, Angèle's boyfriend, decides to get even with Hector, his 'rival'. The jealous guy steals a jewel from a guest and has poor Hector accused of the theft.
A series of random suicides in Rome, Italy are attributed to a heatwave, but a young pathologist named Simona—who is working on a thesis about murders disguised as suicides—suspects otherwise. When a young girl associated with Simona's playboy father ends up dead in another apparent suicide, Simona teams up with the girl's priest brother to prove she was murdered and track down the unknown serial killer.
