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The Mysterious Code (Trixie Belden #7) (original 1961; edition 2004)
Trixie Belden and the Mysterious Code by Kathryn Kenny (1961)
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Amazon.com Product Description (ISBN 0375829784, Hardcover)Principal Stratton wants to get rid of all clubs in Sleepyside High School, including the Bob-Whites! The only way they can save their club is to prove that they help out other people, too. Trixie quickly comes up with a plan to host a benefit antique show and sale. But are the precious antiques in danger from thieves?
(retrieved from Amazon Mon, 30 Sep 2013 13:35:23 -0400)
While preparing for a fund-raiser antique show, Trixie and the other members of the Bob-Whites discover a secret code in the pages of an old magazine in the attic.
(summary from another edition)
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