A man witnesses a murder in a secluded mansion. When he reports it, there's no evidence of the murder, or that anyone was there. Two years later he wakes up in a hospital room after a polo accident to find he's had amnesia, is now married, and living in Switzerland. Now remembering the incident he returns to England to try to solve the mystery.
Louis Jourdan
as Richard Stuart
Mary Tyler Moore
as Elizabeth Sutton
Wilfrid Hyde-White
as Dr. Ralph Sawyer
Stanley Holloway
as Caretaker
Alexander Knox
as Sir Howard Nettleton
Terence Alexander
as Peter Martin
Ronald Howard
as Insp. Huntington
Laurence Naismith
as Lord Dunnsfield
Norman Bird
as Sgt. Hooper
Ernest Clark
as Chairman
Bernard Archard
as Business Spokesman
Nora Nicholson
as Miss Abernathy
