With three knocks, Ruby is cast into a living hell... It had seemed like the perfect job. For months, she could stay in a cabin in the middle of the Yukon wilderness with only a pack of sledge dogs to care for. But from the moment she arrives in the isolated dog yard, something is terribly wrong. She can feel it watching her from the woods. She can hear them whispering to her in the silence. But she is sure it is just a trick of her mind. Until the night they arrive. Three children appear on her doorstep in the middle of the night; each one with pitch black eyes. They plead with her to let them inside, but her rejection draws her into a war of wills against the demonic forces. Isolated in a terrain she doesn't understand, and trapped by an oncoming blizzard, Ruby will have to decide how far she's willing to go to survive. She'll soon learn that it's hard to keep the devil out when you've already opened the door.