Barbara Graham is a woman with dubious moral standards, often a guest in seedy bars. She has been sentenced for some petty crimes. Two men she knows murder an older woman. When they get caught they start to think that Barbara has helped the police arresting them. As a revenge they tell the police that Barbara is the murderer.

Young Rhoda Penmark is sweet, smart … and inherently evil! After a school chum dies during a picnic, no one suspects Rhoda, except the janitor of her apartment building. But when Rhoda’s mother finds out that her own mother was a cold-blooded killer, she begins to suspect Rhoda might be the victim of some faulty genetics.