This was the first of at least four adaptations of Agatha Christie's classic short story "Philomel Cottage" (and of Frank Vosper's stage adaptation of the story). There is some confusion concerning this version and a verssion released the following year; in fact the information at the link refer to the 1938 Edna Best/Bernard Lee film rather than this one.
Beautiful Ann Harding (It Happened on Fifth Avenue, The Magnificent Yankee, The Man in the Gray Flannel Suit) plays beautiful Carol Howard, who falls in love and marries dashing Gerald Lovell (Basil Rathbone, in one of the most controlled over-the-top performances of his career) and soon suspects he is a killer.
Scripted by Frances Marion, one of the most respected screenwriters of the 20th century, and helmed by B movie legend Rowland V. Lee, Love from a Stranger/A Night of Terror surpassed its budgetary restrictions to become a nuanced suspense classic that honored Christie's vision.
Of special interest is the appearance of Joan Hickson, who would become what some think of as the definitive Miss Marple some 55 years later.