When the Thea Sisters compete in a battle of the bands, in hopes of meeting their favorite band Top Direction, they must find their sound, write a song, and identify the saboteur who is trying to ruin their performance.
Joining Squiggle at school, Johnny Boo discovers there is so much to learn, and after solving the mystery of "two plus two," he and Squiggle try to figure out how the Mean Little Boy got bigger--and grew a mustache!