The Sea City High School cheerleaders decide to take to the stage to save the local theater from going bankrupt. But with fires, poison and a bomb in the picture, the girls step into Pep Squad Mystery Club mode when SINISTER ACTS TAKE CENTER STAGE. PEP SQUAD MYSTERIES is a series of mystery chapter book adventures aimed at readers 9 years and up. Each book features easy-to-read mystery-thriller stories with black and white illustrations.