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Called back to active Naval service by Admiral Hawkes (Paul Burke), Magnum (Tom Selleck) is handed the delicate task of pinpointing and plugging a security leak at a Navy base where a top-secret nuclear submarine is docked. The mission proves to be a painful one when it appears that the source of the leak is the fiancee (Simone Griffeth) of Hawkes' own son Andy (Jeff Yagher)--and things go from bad to worse when circumstantial evidence suggests that Andy himself is the guilty one.