Download or read book Magic Tree House 9: Diving with Dolphins written by Mary Pope Osborne and published by Random House. This book was released on 2012-03-30 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: After a break from their trips in the tree house, Jack and Annie are delighted to find that it's back! Morgan le Fay needs their help, but they'll have to become Master Librarians first, and that means solving four riddles. For the first one, Morgan sends them deep into the middle of the ocean. Jack and Annie ride in a mini-sub and meet jellyfish, sea horses and an octopus. But there are some scary sharks in the deep and the friendly dolphins have to come to the rescue. . .