Divine Beginnings by P.C. CAST

Go back in time, fifty years before the events of author P.C. Cast's Partholon books…

Aine knows she was destined to take up the post of Healer at Guardian Castle. But she just can't seem to get used to the stark place or its dreary people, and she longs for the beauty of Partholon. Her only companion in her new home is a centaur huntress, Maev, another outsider. But when Maev is involved in what the warriors call an accident, Aine begins to realize there may be evil forces at work in the castle! And when she is led by her Goddess to an injured winged man – one of the Fomorians Guardian Castle was built to protect against – Aine is forced to make a life–altering choice…