vendor has placed an experimental torpedo and a civilian technician aboard a nuclear fast-attack submarine of the US Navy. After the boat fires the fish during an authorized exercise, the tech sends it on a mission of his own -- to shadow a cruise ship nearby until the US government pays a ransom. The JAG of the Navy sends Harm and a second lawyer, Ltjg. Meg Austin, to investigate and negotiate aboard the submarine. Mind games ensue. Meg, an expert in weapon and computer systems, eventually gets into the tech's laptop computer and the program by which he has controlled his torpedo. Harm and Meg save the day. Meg continues as Harm's new partner.

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