Trixie Belden #7 - The Mysterious Code - 1961
After a string of vandalism in the community, the Sleepyside school board targets "gangs" for extinction including the Bob-Whites of the Glen (B.W.G.) - and you thought gangs in the 21st century were a new phase.
To prove the B.W.G.s are a group of peace and not vandalism, Trixie comes up with the idea of having an antique show to benefit UNICEF (how appropriate the date of this review is 2 days before Halloween - I still remember trick-or-treating for UNICEF!) While trying to find antiques to sell, Trixie discovers a key in the Wheelers' attic, leading her straight into another mystery. Attached to the key is a tag with a coded message.
While babysitting her little brother, Trixie and Bobby are robbed by three masked men as the men are stealing antiques from a neighbor. When the B.W.G.s report the robbery to policeman Spider Webster, Spider seems unconcerned. Trixie becomes convinced someone has targeted people with antiques and she is afraid the antique show collection will be the next target. Do the robberies and the mysterious code have anything to do with each other? Leave it to Trixie and the Bob-Whites to solve this mystery.