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.

When the detective in charge of investigating a series of bank robberies starts to get too close to the culprits, they set up a blackmail scheme to warn him off. But when the crooks begin to fall out with each other, the police learn the truth.