The Captive Shifter by Veronica Scott

Concealing her own considerable magical powers, Caitlyn enters the service of the northern Witch Queen masquerading as a simple healer. Under order from her goddess, she’s searching for a magical gem stolen long ago from her own people, believed to be hidden in the massive castle. The task is daunting but Caitlyn is sure she can locate the gem and escape, bringing the prize back to the temple where it belongs. Until she meets the captive shifter and her loyalties become dangerously divided.

In payment for her past services to his people, Kyler the leopard shifter has entered into a life of servitude far from his forest home, allowing the Witch Queen to tap his magic to power her ever darker spells. Factions at Court are threatening to turn the Queen to the Shadow. Her increasing demands for magic will cut short his nearly immortal lifespan. Kyler’s resigned to his fate until the day he crosses paths with the new arrival, whose secrets and magic entice and attract both man and leopard. Has he met his mate at last?

The Queen will never willingly release him from captivity. Caitlyn’s goddess refuses to grant her any delay in accomplishing her own task. Can they locate the magical gem, fight the Shadow and win free of the Witch Queen to earn the right to be together?