The Mysterious Code (Trixie Belden #7) (2004)

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?

Author: Kathryn Kenny

Categories: Ages 9-12, Literature, Series, Genre Fiction, Children's Books, Literature & Fiction, Mystery & Thrillers