At Jazz’s new school, status is everything – The Pegasus app is constantly rating each student. When Jazz ignores her best friend Cory because his rating slips too low, he runs away to a mysterious other world where the Pegasus is not an app but a highly exclusive café.  To track Cory down, Jazz must navigate her way through unfamiliar territory, assemble a ragtag group of friends, and get back in time for math – and she might just upend the whole rating system in the process.