Amazon.com: High Time for Heroes (Magic Tree House (R) Merlin Mission): 9780307980496: Osborne, Mary Pope, Murdocca, Sal: Books,Magic Tree House Merlin Missions 1-25 Boxed Set (Mth Merlin Mission) (Magic Tree House (R) Merlin Mission),Magic Tree House Merlin Missions Books 1-4 See more,Magic Tree House® Merlin Missions #9: Dragon of the Red Dawn by Mary Pope Osborne (Paperback) | Scholastic Book Clubs,Magic Tree House Merlin Missions Collections 17 Books Set (Books29-45)