When some strongarm hoods try to muscle in on the fight game, hefty Joe Puma is hired to find out who's doing the dirty work. What looks like a typical rackets murder turns out to be a dangerous deal for the private eye. He tussles with some trigger-happy punks and a couple of lethal beauties. Then in one quick leap from mattress to mat he finds himself in a clinch with a murderer who's still fighting, still hating, still bent . . . on the kill.