The #1 bestselling Magic Tree House series for chapter book listeners is ready to whisk you away across the world with Jack and Annie—this time to save sea otters after a shark attack! Perfect for listeners ages 6-9! It’s bright and early when the magic tree house spins Jack and Annie to Monterey Bay, California. It’s their mission to collect sea urchins in the underwater kelp forests! But they know nothing about collecting sea urchins—can a grouchy boat captain help them? Maybe. But Jack and Annie have another problem when Annie finds a badly injured sea otter. They’re not supposed to help the otter. . . but it’s the right thing to do. Can they convince the grouchy boat captain to help them? Did you know that there's a Magic Tree House book for every kid? Magic Tree Perfect for listeners who are just beginning chapter books Merlin More challenging adventures for the experienced reader Fact Nonfiction companions to your favorite Magic Tree House adventures If you're looking for Merlin Mission #40: Eve of the Emperor Penguin, it was renumbered as Merlin Mission #12 when the series was rebranded in 2017.