Magic. Mystery. Time-travel. Join Jack, Annie and the Magic Tree House as they travel to the past on a daring unicorn rescue mission--from the #1 bestselling chapter book series of all time! Jack and Annie must rescue a beautiful magical creature--the unicorn. But when they land in New York City during the Depression of the 1930s, Jack and Annie are confused. Where will they find a unicorn in a big city? Formerly numbered as Magic Tree House #44, the title of this book is now Magic Tree House Merlin Mission #16: Blizzard of the Blue Moon. The Merlin Missions books are more challenging adventures that will delight experienced readers who are fans of the original chapter book series! The Magic Tree House series has been a favorite for over 25 years and is sure to inspire a love of reading--and adventure--in every child who joins Jack and Annie! Did you know that there's a Magic Tree House book for every kid? - Magic Tree House: Adventures with Jack and Annie, perfect for readers who are just beginning chapter books - Magic Tree House Graphic Novels: Jack and Annie's original adventures come to life with full-color, vibrant art, perfect for graphic novel fans and reluctant readers - Merlin Missions: More challenging adventures for the experienced reader - Super Edition: A longer and more dangerous adventure - Fact Trackers: Nonfiction companions to your favorite Magic Tree House adventures