DIANE DUANE is the author of more then twenty science fiction and fantasy novels, including four other books in the Young Wizards series. Four of her Star Trek novels have been New York Times bestsellers. Ms. Duane lives in rural Ireland.

Coming to the aid of a wounded whale, Kit and Nita are plunged into deep wizardry. The whale is a wizard, and she enlists Kit and Nita in battle against the sinister Lone Power. Becoming whales themselves, Nita and Kit join in an ancient ritual performed by whales, dolphins, and a single fearsome shark. But which poses more of a danger: the Lone Power, or edRashtekaresket, the enormous shark as old as the sea?