中年、离异的威尔逊，居住在美国加州奥克兰，孤独的生活使他不由得怀念起过去。

Washington, D.C. psychologist Carol Bennell and her colleague Dr. Ben Driscoll are the only two people on Earth who are aware of an epidemic running rampant through the city. They discover an alien virus aboard a crashed space shuttle that transforms anyone who comes into contact with it into unfeeling drones while they sleep. Carol realizes her son holds the key to stopping the spread of the plague and she races to find him before it is too late.