Unchained (Dark Forgotten Series #3)

Faced with a custody battle for her daughter, monster-killer Ashe Carver has hung up her stakes and taken a job at the public library. But then after centuries guarding a supernatural prison, the dashing Captain Reynard strides into her world. He has only weeks to live unless Ashe finds the thief who took his soul-and he's too drop-dead gorgeous to die...