Summary: It's a frenemy showdown in the eleventh installment in the blockbuster #1 New York Times bestselling Dork Diaries series! Nikki Maxwell has the worst luck. Of all the schools she could have been assigned to for the student exchange week program, she's stuck at North Hampton Hills, her archnemesis MacKenzie Hollister's new school. Even worse, there might just be someone at NHH who can out-MacKenzie MacKenzie! Can the queen of dorks survive a week at the head CCP's new school or will it be a dorky disaster?