What is the one thing—the only thing—you must remember when someone you love sleepwalks? Don’t wake them. Ever. John Walker knows this and has so far taken all the right precautions to protect his wife, Mary Kate. But sometimes no matter what you do, no matter how vigilant you are, things go wrong. John is about to learn that evil is out there waiting for the right moment. And when it strikes, it hungers for more than Mary Kate. It wants their daughter, Lucy. But it’s not his fault—it’s not anyone’s fault. Sometimes bad things just happen.