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
Mary Tyler Moore
Wilfrid Hyde-White
Stanley Holloway
Alexander Knox
Terence Alexander
Ronald Howard
Laurence Naismith
Norman Bird
Ernest Clark
Bernard Archard
Nora Nicholson
Jean Anderson
Elspeth March
Geoffrey Cheshire
Hilary Pritchard
Hugo de Vernier
Norma West
Arnold Diamond
Timothy Kendrick
William Burleigh
Geoffrey Frederick