Married college professor Michael Lane falls in love with one of his students and hatches an elaborate scheme to dispose of his wife, Elizabeth. His murder plot goes as planned. However, he soon receives an anonymous note: "I know what you did, murderer!" Prof. Lane frantically tries to discover who knows his secret...
John Scholz-Conway
Director
Brian Clemens
Writer
Patrick O'Neal
Michael Lane
Angharad Rees
Stella Mason
Michael Kitchen
George Newton
Gerald Sim
Peterson
Gary Watson
Inspector Rush
Patricia Donahue
Elizabeth Lane
Terry Wright
Detective Constable Waters
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