Helen, a race-car driver whose life, both personal and professional, is in a rapid downfall, is invited by her ex-husband's new wife Constance to stay at their plush estate. The two women form a bond, and it's not long before their mutual dislike for the husband culminates into a plan to kill him. Their plan to murder Maurice on a sailing trip goes awry, and Constance is accidentally killed instead. Helen and her ex seize the moment and dispose of Constance's corpse at sea, but when the dead woman's daughter Susan arrives, the young lady begins to suspect that her mother has been murdered.
Carroll Baker as Helene
Jean Sorel as Maurice Sauvage
Luis Dávila as Albert Duchamps
Alberto Dalbés as Dr. Harry Webb
Marina Coffa as Mrs. Susan
Anna Proclemer as Constance Sauvage
Lisa Halvorsen as Solange
A Quiet Place to Kill was released in Italy on February 20, 1970 as Paranoia. It was released in Spain as Una droga llamada Helen (lit. A Drug Named Helen).
Other international releases titled the film A Quiet Place to Kill, as Lenzi's earlier film Orgasmo (1969) had been released internationally as Paranoia. The film was released in the United States in 1973.
The Monthly Film Bulletin described the film as "both sluggish and scrappy, with Lenzi bravely throwing up a screen of object-fixated camerawork and fidgety focusing, but not receiving much help from his players."