Twelve-year-old Milo, a chess prodigy, has lost his passion for the game but is too afraid to tell his mom, his greatest supporter who’s always championed his talent. Instead, he intentionally throws a major tournament. Losing means he loses his chess camp scholarship for the summer. Milo’s mom then announces she and Milo will spend the summer in Princeton, New Jersey, with her friend Nava and Nava’s 10-year-old daughter, Roxie. Nava and Milo’s moms are both single mothers who used sperm donors to conceive. Milo and Roxie work as counselors-in-training at a day camp and discover the ancient strategy game Go, which fascinates them. Through learning and teaching Go, Milo begins to understand himself, builds an unexpected friendship with Roxie, and finds the courage to tell his mom the truth about chess.