Although considered American soil, St. Lawrence Island in northern Alaska is geographically closer to Russia and home to the Northeast Cape Air Force Station. At this remote post, a group of servicemen intercept Soviet radio communications and translate Russian correspondence to English for military purposes.

However, something suspicious is going on. Someone on the inside is sending classified information to an outside source. The first captain who finds a clue to the traitor's identity is killed, and so begins a string of murderous attacks on the U.S. airmen stationed at the site.

The CIA sends a criminal investigator to the Cape, but he is incapable of capturing the spy and ending the murders. Two officers must fight to stay alive long enough to uncover a ruthless killer and stop his brutality before all American's secrets are revealed to the enemy.