It's easy to confuse this movie with Orgasmo (1969) that was released in the US as Paranoia. This is not Orgasmo but Paranoia by the same director Umberto Lenzi.
Minor spoilers. The second of two films starring Carroll Baker and directed by Umberto Lenzi, this one was released in Italy as Paranoia, the American title of its 1968 predecessor, Orgasmo. Baker plays Helen, a racecar driver who recovers from a coma and is summoned to the Majorcan villa of her ex-husband Maurice (Jean Sorel). Constance (Marina Coffa) is Maurice's new wife and wants Helen to help her kill him. Unfortunately for Constance, Helen double-crosses her and she is killed instead. But there are more surprises ahead when Constance's daughter Susan (Anna Proclemer) shows up and tries to kill Helen because she wants to help Maurice, who is revealed to be her lover. The story (co-written by cult filmmaker Rafael Romero Marchent) is all quite complicated. (Robert Firsching on AMG)
Another rare early giallo in the vein of The Sweet Body of Deborah drawing its inspiration from Clouzot's Les Diaboliques and Hitchcock's thrillers showing Carroll Baker in various states of distress and undress, as one IMDb user lovely put. Although he was reviewing a wrong movie, but hey, it's the thought that counts.
The little known Anna Proclemer plays the second violin here, and the first half of the movie is built on their performances, while Jean Sorel plays the third lead portraying a sleazy playboy who's living on rich women's money.
The premise looks like a total rip-off of Clouzot's masterpiece at first, but quickly develops into something different, when this film takes a course of its own and becomes an entertaining web of deceit, lust and greed. And the ending is pure noir. You can even point out the femme fatale.
This movie is one of the key early gialli that should be seen by everyone who enjoys a good plot-twist thriller. Umberto Lenzi and the screenwriters Marcello Coscia, Bruno Di Geronimo and Rafael Romero Marchent were clearly more inspired by the old masters like Clouzot and Hitchcock than Mario Bava and his first Italian thrillers.
This rip is from an Italian DVD that had no subtitles. Bonnie at HHAH made the English subitltes with the help of Weezee so we can finally throw away our bootlegs and enjoy the movie in near DVD quality. (Notes By Daeron thanks!)