CAST A DARK SHADOW:

An evil con artist marrys elderly women, kills them off, and takes their fortunes, until he meets his match with his latest victim.

CAST: Dirk Bogarde, Margaret Lockwood, Kay Walsh, Kathleen Harrison DIR: Lewis Gilbert (1955)
 

THE LATE EDWINA BLACK:

A mean woman who rules her household with cruel force suddenly falls ill and dies. When the post-mortem reveals that she was poisoned, members of the household become suspects. 

CAST: David Farrar, Geraldine Fitzgerald, Roland Culver, Jean Cadell. DIR: Maurice Elvey (1951)