Ex-Army pilot Steven Kenet (Taylor) returns home suffering blackouts from a head injury and then discovers his wife Helen (Patrick) is cheating on him with her smug boss Whitcombe (Marshall). When Helen is strangled, Steven is accused of murder but is sent to a mental hospital for observation under the care of shrink Ann Lorrison (Totter). Steven escapes to prove his innocence but the very cold-blooded killer has other ideas.