Bestselling author Nancy Krulik delves into the mind of a twelve-year-old trying to survive middle school.It's fall spirit week at Joyce Kilmer Middle School, and the Pops have established their own exclusive "pep squad," complete with matching outfits! Jenny's friends decide to fight back by forming a rival group with their own uniforms. Things heat up even more when a costumed lion mascot appears on the scene. No one knows who's inside--is it a Pop... or not?