A Quiet Place to Kill (Italian: Paranoia) is a 1970 giallo film directed by Umberto Lenzi.

[2][3][4] Helen, a racecar driver whose personal and professional life is rapidly declining, is invited by her ex-husband Maurice's new wife Constance to stay at their plush estate.

The two women form a bond, and it is not long before their mutual dislike for the husband culminates into a plan to kill him.

Their plot to murder Maurice on a sailing trip goes awry, and Constance accidentally gets 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 suspects that they have murdered her mother.