Haunted Castle on Hallow's Eve The castle looms dark against the light of the moon. Merlin the magician needs someone smart enough to solve the mystery of how the castle became haunted and return it to its rightful owners--so Jack and Annie take on their second Merlin mission in the magical realm of Camelot.
Summer of the Sea Serpent Jack and Annie are off on another mythical mission at the request of Merlin the magician. Luckily, they have a young sorcerer, Teddy, to help them. From underwater caves to a Spider Queen, from mystical selkies to a magical sword, this is a Magic Tree House adventure kids won't want to miss!
Winter of the Ice Wizard Jack and Annie, joined by Teddy and Kathleen (from earlier books), travel in the Magic Tree House to a land of snow where the Ice Wizard has captured Morgan and Merlin. The four friends must find the Ice Wizard's missing eye . . . or is it really his heart that is missing?