The Hexiles (The Hexiles #5)

As Romy delves deeper into her dead father's secrets, the rest of The Hexiles venture into the town that sits in the shadows of the demon-haunted castle. There, they realize they hold the status of celebrities. But those who worship the infernal have a strange way of showing their adoration. Meanwhile, Romy has a heart-to-heart with the dead father she never knew.