Kristy's not too happy with some things at Stoneybrook Middle School. The hot lunches, for example, look like dog food. And Kristy's class has to perform Mary Poppins for their annual play. How babyish can you get? What the eighth grade really needs is a new class president. Someone who is organized and has great ideas. Someone like - Kristy! But can Kristy coach a softball team, get straight A's, baby-sit, run the BSC, and be president? The Baby-sitters are about to find out!