Long ago Miren O'Malley's family prospered due to a deal struck with the Mer: safety for their ships in return for a child of each generation. But for many years the family have been unable to keep their side of the bargain and have fallen into decline. Miren's grandmother is determined to restore their glory, even at the price of Miren's freedom. A spellbinding tale of dark family secrets, magic and witches, and creatures of myth and the sea; of strong women and the men who seek to control them.