Una sull'altra

Una sull'altra
Directed by	Lucio Fulci
Produced by	Edmondo Amati Maurizio Amati
Written by	José Luis Martínez Mollá
Screenplay by	Lucio Fulci Roberto Gianviti
Story by	Lucio Fulci Roberto Gianviti
Starring	Jean Sorel Marisa Mell Elsa Martinelli Alberto de Mendoza John Ireland
Music by	Riz Ortolani
Cinematography	Alejandro Ulloa
Edited by	Ornella Micheli
Production company	Empire Films Les Productions Jacques Roitfeld Trébol Films C.C.
Release date	15 August 1969
Running time	97 min 107 min (uncut version)
Country	Italy France Spain
Language	Italian
Box office	₤869,000,000

Una sull'altra is a 1969 Italian giallo film directed by Lucio Fulci. Written by Fulci and Roberto Gianviti, the film stars Jean Sorel, Marisa Mell, Elsa Martinelli, Alberto de Mendoza and John Ireland.

Una sull'altra was filmed on location in several United States cities, including a scene filmed in San Quentin State Prison's gas chamber. The film went on to gross ₤869,000,000, and has been cited as a thematic precursor to later films such as Basic Instinct and Body of Evidence.

George Dumurrier (Jean Sorel) is a wealthy doctor with the emphasis on the business. He runs a clinic with his younger brother Henry (Alberto De Mendoza), but leaves care of his asthma-stricken wife Susan (Marisa Mell) to her sister Martha (Faith Domergue) and a local nurse. George is soon revealed to be having an affair with Jane (Elsa Martinelli), the personal assistant to Larry (Jena Sobiesky), a trendy photographer. Although very much in love with George, Jane is fatalistic about the future of their relationship.

George and Jane travel out of town for a romantic break in Reno. But after arriving at the casino, George receives a phone call from Henry telling him that Susan has died during a violent asthma attack. Returning home to his plush San Francisco home, George is consoled by Henry, but frozen out by the hostile Martha who has always disapproved of George marrying her sister. However, a $1 million insurance policy left by Susan is a timely bonus for George's recklessly extended business enterprise. But perhaps too likely as an insurance agent (Bill Vanders) begins tailing George, discovers his affair with Jane, and brings his suspicions to the local police detective, Inspector Wald (John Ireland).

Meanwhile, an anonymous tip-off leads George and Jane to 'The Roaring Twenties', a strip club where they are both astonished at the appearance of Monica (also Marissa Mell), a nightclub stripper who, although a luxuriant blond, bears an uncanny resemblance to the dead Susan. George is morbidly attracted to her and soon embarks on an affair that is part detection, part willing seduction. When the police, who have been tailing him, arrest Monica, she tells them that she was paid to pose as Susan by a woman calling herself Betty. Monica, as the police discover, is a popular fixture lately among the city's high class prostitutes. She has a devoted wealthy client, named Benjamin Wormser (Riccardo Cucciola), whose hopeless passion she toys with. When Benjamin hears about Monica's arrest, he arrives at the police station with her exorbitant bail, but soon discover that she has already been spring by someone the police will not name.