Mike Hammer gives a lift to a beauty on the run from a sanitarium—but their joyride is cut short by two dark sedans full of professional killers, who knock the detective out cold. When he wakes up, his car has been rolled off a cliff, with his mysterious passenger still inside it. The feds take his gun away on suspicion, but Hammer’s not about to let that stop him. He’s on the hunt for the men who wrecked his ride and killed a dame in cold blood—and he’s going to teach them that armed or not, crossing Mike Hammer is the last thing you should ever do.