For three Border Patrol agents working a remote desert checkpoint, the contents of one car will reveal an insidious plot within their own ranks. The next 24 hours will take them on a treacherous journey that could cost them their lives.

神秘瘟疫摧毁了地球并把大部分的人类变成了吃不饱的嗜血动物，多年之后，一个离群索居的漂流者在猎杀变异人的途中在一个废弃的警察局里与一群幸存者偶遇，然后不情愿地同意尽力保护他们帮助他们逃往庇护所。