This chilling spine-tingler features Doris Day in the atypical role of Kit Preston, an American woman, newly married to a British financier (Rex Harrison), who finds herself being stalked on the streets of London and over the phone by an unseen assailant. With her spouse believing her to be the victim of a practical joker, or, quite possibly, delusional, will Kit be able to save her sanity... and her life? John Gavin, Myrna Loy, Roddy McDowall also star in this film version of the play "Matilda Shouted Fire" by Janet Green.