When his mother eloped with an Italian opera singer, Louis Mazzini was cut off from her aristocratic family. After the family refuses to let her be buried in the family mausoleum, Louis avenges his mother's death by attempting to murder every family member who stands between himself and the family fortune. But when he finds himself torn between his longtime love and the widow of one of his victims, his plans go awry.
Dennis Price
Louis Mazzini / His Father
Alec Guinness
The D'Ascoyne Family: The Duke / The Banker / The Parson / The General / The Admiral / Young Ascoyne / Young Henry / Lady Agatha
Joan Greenwood
Sibella
Valerie Hobson
Edith D'Ascoyne
Audrey Fildes
Mama
Miles Malleson
The Hangman
Clive Morton
The Prison Governor
John Penrose
Lionel Holland
