Steven Kenet catches his unfaithful wife Helen in the apartment of Willard I. Whitcombe, her boss, and she is strangled to death. He attempts to commit suicide by driving his car into the river, even though they have a six-year-old son. Kenet survives but is sent to the county psychiatric hospital for evaluation to determine if he is sane enough to be charged with murder. He has no memory of what happened, likely due to a pre-existing brain injury from the war.