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Peggy, Rita and Dot are practicing furiously for the upcoming band concert. Dot plays drums, Rita plays saxophone, and Dot is on trombone... but also causes a lot of problems when she fools around during practice. Annoying Mr. Volrath. When the girls find out that a concert is scheduled for the same day as a math competition, they don't know what to do. Peggy and Dot don't care as much about the math, but since that is Rita's forte, she wants to skip the concert. Mr. Volrath is very understanding of whatever choice students make, but when musical instruments start disappearing, the girls bring their detective skills to work. Ms. Khan, who works at the school, invites the girls to tea with the Secret Spy Society, and introduces the girls to a group of top notch code breakers who teach the girls some tricks. Peggy is sure that Mr. Volrath is behind the missing instruments, and sneaks off to the school with Chiquita, whom she leaves outside in the rain since she can't bring a cheetah into school even after hours. The school is empty but unlocked, so Peggy goes inside. She is surprised to find Matthe in the building. He claims to be in the building studying for the competition all weekend, but things quickly change. Rita and Dot worry when Peggy doesn't come home, and head off with the spies to try to find her.