Seventeen-year-old Sarah Midnight has never had a normal life. To the outside world she is a typical teenager, but on the inside, Sarah holds an unimaginable secret. Her parents are demon hunters, part of a web of Secret Families who have sworn to protect the world. But when they are mysteriously killed, Sarah's world is shattered but she knows she must now take up their fight. Unprepared for the task ahead, she finds herself thrust into a world of incredible danger, full of things she never even knew existed. Including her enigmatic long-lost cousin who, out of the blue, turns up on her doorstep just when she needs him most. He claims to be there to help and protect her, but how will she know who to trust in this perilous new life? And can she stay alive long enough to complete her parents' quest when they have left her so defenceless? Sarah has to learn, and learn fast - the demons are all around her and death waits for no one...