French lovers Clementine and Lucas live an idyllic, if somewhat isolated, existence in their newly purchased chateau in the Romanian countryside. But tonight that paradise will be shattered beyond all comprehension. Because something is watching. Something is waiting. Something unknown, unhinged and unrelenting.They are all around, they are in the shadows, and they will stop at nothing to get inside the distraught couple's dark, cavernouws home. As blind panic takes over, Clementine and Lucas must face a terrifying test of endurance to discover the true nature of the evil just outside their door - the true nature of "them".