A simple job turns deadly when Mary Wandwalker, novice detective, is hired to chaperone a young American, Rhiannon, to the Oxford University Summer School on the ancient Celts. Worried by a rhetoric of blood sacrifice, Mary and her operatives, Caroline, and Anna, attend a sacrifice at a sacred well. They discover that those who fail to individuate their gods become possessed by them. For the so-called Reborn Celts,...