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On the night of Sergeant Doheny's retirement dinner, vicious sexual predators raped and murder his granddaughter. He tracks them to Hawaii and enlists Magnum's help in finding them. When he finds one of the men, his relentless pursuit drives the man in front of a bus, fatally. When Doheny explains what happened to Magnum, he realizes the man intends to kill the other suspect, and determines to find the killer first, to spare Doheny a murder rap.