In Fort Meade, Maryland,Operation Doomsday is activated. Vietnam veteran Robert Bellamy of U.S. Naval Intelligence, a disillusioned man recovering from a broken marriage, is dispatched on a top secret mission. A weather balloon carrying sensitive military information has crashed in Sweden. Although the contents have been rescued, Bellamy must locate the ten witnesses to the incident so that they can be sworn to secrecy. However, as he conducts his search, Bellamy begins to suspect that he is also being hunted and by an unknown lethal force – and that what he was told about the balloon is only a part of an almost unbelievable happening.