Plot: Earth has been invaded by an unseen enemy. These invaders take over the minds of humans, while leaving their bodies intact. Most of humanity has already succumbed. When Melanie (Ronan) is captured, she is certain it is her end. But, even as she fights against invading "soul" Wanderer, outside forces make the two of them unwilling allies, and they set off on a dangerous and uncertain search for the man they both love.