Blackfrost — Jaye McKenna

"When the Wytch Council assigns Kian as healer to Prince Ambris, he is sent to the isolated country estate of Blackfrost. There, Kian finds a desperate man nearing the end of his endurance, a mystery, and a chance for love."
Son of a simple blacksmith, Apprentice Wytch Kian has always known that once his apprenticeship is over, he'll be sent far from home to serve the Wytch Council. Before his training is even complete, Wytch Master Taretha orders him to Blackfrost, an isolated country estate, where he is to serve as personal healer to Prince Ambris of Miraen.
Nothing in Kian's experience has prepared him for what he finds at Blackfrost, and every day brings new questions. Like why is Prince Ambris being kept prisoner at Blackfrost? Where does Wytch Master Taretha take him every fortnight? And why does the prince return from these excursions suffering from horrific injuries that Kian is expected to heal?
Kian quickly learns that seeking answers to these questions could cost him his life. Worse, he soon finds himself struggling with his growing feelings for Ambris, putting him at odds with both Wytch Master Taretha and the sadistic guard captain, Malik. Can Kian unravel the mystery in time to save Ambris? Or will the prince finally succumb to madness and destroy Blackfrost and everyone in it?