Rita is an ambitious young gangster's moll in Paris, kept by the elegant Fred who acquires a load of gold ingots in transit. She betrays Fred to another gang boss, Charles, on the understanding that she will get 50%, but Charles, once he has the gold, rats on the deal. Rita goes to ask help from her aunt Léontine, living in retirement on the Riviera after being the mistress of major gangsters. Léontine comes up to Paris and Charles, already tracked by Fred who wants his gold back, tries to eliminate this new menace. His first ploy, sending his handsome young nephew Tiburce to murder her, fails as Rita falls in love with him. When a full-scale night assault on Leontine's house ends with the corpses of his men going into the central heating furnace, Charles is more ready to compromise and agrees to make a generous settlement if the two young people get married. On the day of the wedding he is still prevaricating, so Leontine shoots him dead and the festivities commence. She has cheated Fred out of his remaining booty, which can go to set up Rita.
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