At some point in the future, mysterious aliens invade the Earth in large numbers. There is no destruction, no war, they occupy the human body in a special way, and transform this Earth, which has long been exhausted by human civilization, into a seemingly peaceful and happy paradise. However, there are still a few people who are unwilling to give up their independent personality and rich emotions and memories, and they are making the final resistance for this. The beautiful girl Melanie Stead (Saoirse Ronan) resisted to death, but still could not avoid the fate of being eroded. The new wanderer occupied her body, but Melanie's consciousness did not disappear. The wanderer searched Melanie's memory according to the order of the explorer (Diane Kruger), and learned about the existence of her brother Jimmy (Chandler Canterbury) and the boy she loved, Jared Howard (Max Irons). In this process, the originally hostile Wanderer and Melanie gradually became harmonious, and the sudden event forced them to join hands on the journey of saving their loved ones. This film is adapted from Stephenie Meyer's novel of the same name.