The lawyer for a wealthy couple asks Mike to help their niece kick her heroine habit. Mike works on two fronts: helping the young woman withdraw from the drug and finding the pushers that got her hooked in the first place.

Mike's quest for peace and quiet is interrupted when he intervenes in a lover's quarrel fought in a swanky restaurant. The next day, Mike is hauled into court and forced to post a peace bond guaranteeing that he'll stay away from the man he fought with the previous evening. When the man turns up dead and his fiancée accuses Mike of the crime, Hammer has to go on the lam to clear himself of the frame-up.

A psychiatrist fears that his patients are being blackmailed. He hires Mike to find out if his fears are founded, how the privileged information is being leaked and who is preying on his clients.

A death row convict confesses to a murder that another man was executed for three years earlier and threatens to supply proof after his execution.