A Los Angeles teacher becomes a mob target when he agrees to be a star witness in a gangland murder case.

Demonstrating that a little knowledge is a dangerous thing, a convicted strangler studies the paranormal and finds a way to render himself invisible. Once he escapes, he sets out to find and eliminate five women who remind him of the mother he murdered. A police lieutenant sets out to safeguard them and bring the invisible killer to justice.

Three beatniks are brought together to rob an armored car, only to face betrayal from amongst their ranks.

1957 film by Gene Fowler Jr.