One on Top of the Other

One on Top of the Other
Italian film poster
Directed by	Lucio Fulci
Screenplay by	Lucio Fulci Roberto Gianviti José Luis Martínez Mollá
Story by	Roberto Gianviti Lucio Fulci
Produced by	Edmondo Amati
Starring	Jean Sorel Marisa Mell Elsa Martinelli John Ireland Alberto de Mendoza Jean Sobieski Faith Domergue
Cinematography	Alejandro Ulloa
Edited by	Ornella Micheli
Music by	Riz Ortolani
Production companies	Empire Films Les Productions Jacques Roitfeld Trébol Films C.C.
Distributed by	Fida Cinematografica (Italy) Alpha (France) Atlántida Films (Spain)
Release dates	15 August 1969 (1969-08-15) (Italy) 25 November 1969 (1969-11-25) (Spain) 21 August 1970 (1970-08-21) (France)
Running time	108 minutes
Countries	Italy France[1] Spain[1]
Languages	Italian English
Budget	₤445 million[2]
Box office	₤869 million

One on Top of the Other (Italian: Una sull'altra, which the English title translates accurately but without expressing twice the feminine),^[3] also known as Perversion Story, is a 1969 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. The first giallo directed by Fulci, its plot concerns George Dumurrier (Sorel), an unscrupulous San Franciscan doctor who is suspected of orchestrating the death of his asthmatic wife Susan (Mell) as part of an insurance scam, despite her seeming reemergence as Monica Weston, a high-class stripper.

One on Top of the Other 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 Italian lire and has been cited as a thematic precursor to later films such as Basic Instinct and Body of Evidence.