In their magic tree house, Jack and Annie are again transported to King Arthur’s realm, where invisible beings, giant ravens, and mistaken magic spells have a duke’s castle in an uproar on Halloween night.
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  1. Haunted Castle on Hallow's Eve by Mary Pope Osborne (Random House, June 2003) [print · e-book].
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Mary Pope Osborne