Hammer saves a woman from two men in Central Park. He escorts her home and somebody kills her on her front steps. The clues point to her employer, Intervision. When Hammer is told the police have been ordered not to look for the murderer he is realises that something big is happening. It appears that the woman had stolen something that a lot of people wanted. There are twist and counter-twist in the story as Hammer tires to find out what the mystery is all about.