On the first day of seventh grade, twin sisters Payton and Emma have been assigned entirely different schedules -- for the first time ever. Without telling anyone, the twins switch places: Cool Payton goes incognito as quiet Emma, while mathlete Emma impersonates fashionista Payton. No one -- from their new teachers to their clueless classmates -- realizes they've made a switch. The twins quickly find out that playing a different role in life can be a lot of fun -- and that no one is exactly the person the rest of the world thinks they are.