Morgan le Fay will make Jack and Annie masters of the tree house if onlythey can solve four riddles -- which will take four books, of course! "Dolphins at Daybreak" begins the third set of four books in this magical(and increasingly popular) series! Jack and Annie are off in the Magic TreeHouse again, this time to a whole new world under the ocean. Complete with agiant octopus, a hungry shark, and dolphins to the rescue, this Magic TreeHouse book delivers an underwater adventure kids can dream about.