Kassandra Thorne's life was perfectly ordinary-until the day she and her brother, Kanan, were abducted. While subjected to brutal experiments, they unearthed a power they never knew they possessed-a power that made them feel more like monsters than human. Their escape thrust them into the world of the supernatural, where survival meant mastering their abilities and confronting the truth: they aren't the only monsters out there. Now, years later, Kassandra and Kanan are still running-haunted by their past and hunted by those who created it. But when unexpected allies and dangerous new threats cross their path, the siblings are faced with a choice: continue to run, or confront the darkness chasing them.