Exiled

Long ago, Cassandra, a powerful witch, nearly destroyed the world of Arroway in her grief over the murder of her mate, Callum. She has spent the years since exiled on Earth, believing she can never return home.
Tied to the world by the strength of his love for Cassandra, Callum has been lost in a land between life and death. Now, after a thousand years, he has found a way back to her.
But Arroway is dying and the witches close to extinction. Only by working together can Cassandra and Callum hope to save their world. But can she risk giving back her heart to a man, when losing him once led to the near destruction of everything she loved?