John Kelly is back in the States after serving as a SEAL in Vietnam. Working as an underwater demolition expert and diving instructor, Kelly meets a woman and falls in love with her. But the woman's past catches up with her and she is murdered. Kelly is going to revenge her murder in his own way. At the same time Pentagon discovers a POW camp in North Vietnam where US soldiers are kept. CIA recruits Kelly who becomes known as Mr. Clark. His mission is to attempt a rescue of the POWs.
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