A heartfelt middle-grade novel about ex-best friends, betrayals, and revenge that is best served sour. Revenge is sweet! For as long as she can remember, Mai has spent every summer in Mystic, Connecticut visiting family friends. And hanging out with her best-friend-since-birth, Zach Koyama, was always the best part. Then two summers ago everything changed. Zach humiliated Mai, proving he wasn't a friend...