Angelo "Snaps" Provolone made his dying father a promise on his deathbed: he would leave the world of crime and become an honest businessman. Despite having no experience in making money in a legal fashion, Snaps sets about to keep his promise.
Hardened criminal Maggie Hayward's consistent violence, even in police custody, ends in the execution chamber. However, top-secret US government agent 'Bob' arranges a staged death, so Maggie can be elaborately trained as a phantom killer and subdued into obedience.