The mental breakdown of a guilt-ridden man provides the drama in this fascinating psychological profile starring Richard Attenborough as a scientist who can't live with himself after he accidently kills the brother of his fiancee.

Directed by: Don Chaffey
Written by: Alun Falconer
Runtime: 88 minutes
Tagline: A night of shattering suspense
Cast:
Richard Attenborough Richard Attenborough
Peter Watson 
Alfred Burke Alfred Burke
Mr. Barnes 
Kenneth Griffith Kenneth Griffith
Pollen 
Donald Houston Donald Houston
Dr. Sanderson 
Walter Hudd Walter Hudd
Superintendent 
Edward Judd Edward Judd
P.C. Stevens