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Tree House Mystery: A Graphic Novel (Boxcar Children Graphic Novels) (2010)
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Amazon.com Product Description (ISBN 0807580880, Paperback)The Aldens have new neighbors, and they're helping them build a tree house! From up high they can see things they hadn't seen before. There's a strange round window on the house next door that's been hidden by trees - but nobody can find the window from inside the attic. Does their neighbor's old house have a secret?
(retrieved from Amazon Mon, 30 Sep 2013 14:21:23 -0400)
The four Alden children have new neighbors and they're all building a tree house.
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