Hardened criminal Maggie Hayward's consistence violence, even in police custody, ends in the execution chamber. However, top-secret US government agency official 'Bob' arranges a staged death, so she can be elaborately trained as phantom killer and subdued into obedience. As a cover, she gets a new identity as saleswoman Claudia Anne Doran and a wonderful house-mate, building super J.P., a broad-minded, gentle photographer. The two fall in love, but that complicates hit jobs. His good influence extends to breeding her a conscience that puts love over business, alas unlike Bob's agency.