Power of the Damned (Aherian Chronicles) by Jennifer Bukowiec

Arabella was never meant to survive. Orphaned and adopted into the royal family of Verower, she has lived a life wrapped in silk — and secrets. Beneath her gentle facade lies a truth the queen guards jealously: Arabella is a witch, one of the last, and her power could unmake kingdoms. Terrified of what she is, Arabella has spent years suppressing her magic. But when the queen announces her engagement to Prince Raynor, Arabella learns the betrothal is no political alliance — it’s a trap. The queen intends to use her power to wage war. Arabella’s desperate attempt to escape ends in blood. Accused of a murder she didn’t commit, she’s thrown into the palace dungeons to await execution. Her only salvation comes from an impossible source — a man who claims to be the God of Water, bound in mortal form. To survive, Arabella must embrace the magic she’s denied and unravel the gods’ schemes entwined with her own. But freedom has a cost, and power always demands a sacrifice.