When wannabe-singer Oscar is fired from her band and her boyfriend walks out, she heads to a remote cabin in the woods outside a ghost town called Tarnation to reflect on her life choices. But the woods are home to a demon unicorn, whose satanic master seeks Oscar's blood to complete a ritual that will raise Satan himself from Hell. Oscar must battle with a ungodly force of evil, capable of possessing any soul, to not only save her own life but to stop TARNATION descending upon the world.

L’énigmatique M. Roarke donne vie aux rêves de ses chanceux invités dans un complexe hôtelier luxurieux et isolé. Mais quand leurs fantasmes les plus fous se transforment en véritables cauchemars, les invités n’ont d’autre choix que de résoudre les mystères de cette île pour en sortir vivants.