『朋友夫妇换交换完整版小说』介绍:一批为美军研制秘密武器的科学家神秘失踪。Tyler领导的海军陆战队员奉命前去查明真相，途中遭遇前所未见的强大敌人，一场大杀戮开始了…… 　　On a remote US Army facility a group of scientists conducting top secret weapon experiments vanish. An elite covert ops team commanded by Lt. Tyler (Kevin Sorbo) is tasked with recovering the missing personnel within 24 hours. The unit arrives only to find out there objective may not be what it seems, what was strictly a search and rescue mission has now become search and destroy. With time running out and the death count rising Tylers team must begin the hunt or fall prey to a predator unlike any they have ever encountered.