Jack and Annie travel in their magic tree house to the land of the mystical selkies to seek a magical sword for Merlin.
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  1. Summer of the Sea Serpent by Mary Pope Osborne (Random House, March 2004) [print · e-book].
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Mary Pope Osborne