for Jessi and the Dance School Phantom by Ann M. Martin
The hit series is back, to charm and inspire another generation of baby-sitters! Naturally, Jessi is thrilled when she earns the lead role her in dance school's latest ballet. But someone in class wants her out of the show. First Jessi's toe shoes are stolen. Then she gets all kinds of threatening messages! What kind of ballerina would want to scare Jessi? The Baby-sitters don't know, but they're not going to let anyone get away with it for long. The best friends you'll ever have--with classic BSC covers and a letter from Ann M. Martin!
Publisher description retrieved from Google Books.