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Magic Tree House (31) Summer of the Sea Serpent (edition 2011)
by Mary Pope Osborne, Sal Murdocca (Illustrator)
Magic Tree House #31: Summer of the Sea Serpent by Mary Pope Osborne
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Wikipedia in English
Amazon.com Product Description (ISBN 0375827358, Hardcover)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!
(retrieved from Amazon Mon, 30 Sep 2013 13:46:40 -0400)
Jack and Annie travel in their magic tree house to the land of the mystical selkies to seek a magical sword for Merlin.
(summary from another edition)
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