When two sailors are murdered trying to sell classified materials to the Soviet Union, the Naval Investigative Service determines there might be a massive leak of intelligence from one navy ship. They decide the only way to investigate the possible hemorrhage of information is to place someone into the radio shack of the flagship of the Seventh Fleet Commander, the USS Oklahoma City. Because of his unique training and recent combat experience in Cambodia, the choice is clear for the NIS: Radioman Matthew "Bert" Bertram. He has the skills both as a radioman and field agent, and The NIS believes he is the only one capable of stopping the spies.