As a Vietnam veteran and former Special Forces sniper descends into the throes of mental illness, he latches onto a lonely pregnant teenager and a group of Pentecostal zealots - the Children of Light - who have been waiting over thirty years in the Arizona desert for Armageddon. When the Amtrak Sunset Limited, a passenger train en route to Los Angeles, is derailed in their midst in a deadly act of sabotage, their lives are thrown into turmoil as local and state police, FBI investigators, and a horde of reporters arrive on the scene. As the search for the saboteurs heats up and the authorities.