Magic Tree House 4 Hardcover Books by Mary Pope Osborne Good-Very Good. Summer of the Sea Serpent, Dragon of the Red Dawn, Winter of the Ice Wizard, Danger in the Darkest Hour.  As you can see, one book does not have a jacket. A picture of the title page is posted. Aside from that, these books are in very good shape. Condition is Good. Shipped with USPS Media Mail.