Captain Jim Leslie, a US Air Force pilot, is transferred to a remote Alaskan base not far from the Soviet border. Here he meets his old friend Harris again and falls in love with Brenda, the commander's daughter. He then comes into conflict with her fiancé, Senator Gordon Gray. At his instigation, he is sent on a dangerous mission with Harris and the navigator Hester: During a storm, the buoys deployed to locate Soviet submarines must be checked. During the emergency landing on an ice floe, Harr...