A hunter lies in wait. Nessa McRae is a tattoo artist who is enjoying an ordinary life when a demon sets his sights on her. Determined to capture her at all costs, Nessa's world quickly gets turned upside down. Unfortunately for her, life may never be normal again. Enter Ailes MacGillivary, a half-demon/half-human and a Nightingale—a group of paranormals who secretly protect the city from monsters. He is determined to protect Nessa at all cost, yet he is filled with secrets that could change everything in her life, making him either the best thing for her or the worse. The world has more secrets than Nessa could ever imagine, and if she's not careful, those secrets just might cost her everything. Can Nessa and Ailes stop the hunter before he finds her, or will they lose everything?