If there's one thing Polly McDoodle doesn't like, it's change. But things are changing all around her: her brother has moved to Regina to play hockey; the treehouse headquarters of the Clay/McDoodle Detective Agency got wiped out in a summer storm; her mentor and friend Isabel has headed for an artist colony in Mexico; her friend Erin has moved to Winnipeg; she's starting a new school; and—the icing on the cake—the homeroom teacher she was finally getting used to has to take a sudden leave and gets replaced by a sloppy, obnoxious loser. What Polly needs to snap herself out of the blues is a good mystery—and then she sees a bizarre incident at a mailbox outside the school. Suddenly people's mail—especially the envelopes that hold cash or credit cards—starts to go missing. Polly and her partner Kyle and their new friend, a troubled and sad girl named Mandy, are on the case. But there's no shortage of suspects: What about Sidney and Darrell, those two surly high school dropouts? Or Polly's trendy new transplanted Texan classmate Tommie Lee and her oddball mother? And what's the deal with that new teacher? s the trio searches for clues and sifts through evidence, the thief gets more daring and things get more dangerous. Can they solve the mystery? And more importantly, can they stay safe? Mary Woodbury is the best-selling author of the young adult title The Ghost in the Machine, the Polly McDoodle Mystery Series, and Jess and the Runaway Grandpa, a finalist in the Silver Birch Young Readers Choice Award, and a Canadian Children's Book Centre "Outstanding Title of the Year."