Grant Ormsbee returns, this time to extract whatever he can from recovered Soviet submarine components. A year earlier, the Navy recovered about half of a downed Soviet submarine, and now new debris has drifted in to shore - including a unit that Ormsbee believes will help him read the computer core. He adds Margaret Hammond, an expert in ocean currents, to his team to help retrieve any additional debris. But gangsters capture David Hammond, Margaret's brother. Why is their boss Emil Radick so interested in Naval research?