Magic Tree House Merlin Missions. 1-25 : Random House Books for Young Readers : 9781524765248 : 1524765244 : 30 Aug 2017 : Merlin Mission Books 1&;25 of the #1 New York Times bestselling Magic Tree House series boxed together for the first time ever!   Magic Tree House Merlin Missions are more challenging adventures for the experienced Magic Tree House reader. In each adventure, Merlin the magician sends Jack and Annie on an adventure in the magic tree house.   Books in this Merlin Missions set include: Christmas in Camelot (#1), Haunted Castle on Hallows Eve (#2), Summer of the Sea Serpent (#3), Winter of the Ice Wizard (#4), Carnival at Candlelight (#5), Season of the Sandstorm (#6), Night of the New Magicians (#7), Blizzard of the Blue Moon (#8), Dragon of the Red Dawn (#9), Monday with a Mad Genius (#10), Dark Day in the Deep Sea (#11), Eve of the Emperor Penguin (#12), Moonlight on the Magic Flute (#13), A Good Night for Ghosts (#14), Leprechaun in Late Winter (#15), A Ghost Tale