What would you do if you discovered your son wasn't really your son? He may look like him, act like him, but deep down in your soul you just know... he's been replaced. Then your worst fears are realized when the light hits his face just right and you accidentally see his true appearance for yourself. But he isn't the only one you discover... your neighbor, your friend, even your husband. Do you scream? Do you run? Or do you fight back? And how can it be that your daughter is the best and, perhaps, last hope for mankind?