Plot: In Paris, after six months working with children, the decorated rookie policeman Nestor Patou is assigned to work in the red light district on the Casanova Street, a place crowded of streetwalkers, pimps and corrupt police officers. The honest Nestor, who is naive and strictly by the book, notes the movement of couples in the Casanova Hotel and befriends the prostitute Irma La Douce (believing that she is a lady. When he discovers that she is also a streetwalker, he calls the central station for a raid in the hotel. However, among the arrested costumers is the corrupt Chief of Police Lefevre that has a scheme with the pimps union. Nestor is fired with a dirty record and has difficulties to find a new job; he goes to the bistro of the versatile and experienced Moustache to drink, and he starts a conversation with Irma La Douce. However, her bully pimp Hippolyte fights against Nestor, but he beats him up. Irma brings Nestor home and he becomes Irma's pimp. However he falls in love for her and he is jealous when she meets a client. He decides to create the wealthy British Lord X to be the only regular client of Irma. But things go wrong when Nestor is jealous of Lord X and decides to end his character.
Alternative Plot: This entertaining comedy finds disgraced former police officer Nestor Patou (Jack Lemmon) falling for beautiful Parisian prostitute Irma La Douce (Shirley MacLaine). Though Nestor becomes Irma's pimp, he can't stand the idea of her being with clients, so he devises a way to keep her all to himself. This scheme leads to plenty of trouble, however, and soon Nestor is forced to avoid his old law-enforcement peers in an attempt to stay with Irma and out of jail.
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