Lieutenant Jack Morton of NATO survives a terrorist strike on the Blue Harvest—an armored train—as its sole survivor. Aided by Christina Wayborn, the French ambassador's bodyguard, he must fight through the train's carriages to neutralize the terrorist cell led by Boris Zugoski, rescue the kidnapped French ambassador, and prevent the detonation of a nuclear weapon on board. The crisis deepens when Phillip Mason, a close associate of the ambassador, is revealed to be a double agent. What Morton hands over determines how the mission ends—and who walks away.