The Hammond family is living in DC, where everything seems to be going just fine, until it becomes clear that the oldest daughter, Tilly, is developing abnormally - a mix of off-the-charts genius and social incompetence. Alexandra and her husband, Josh, have tried everything to help their daughter, who has been called "undiagnosable," though she seems to fall somewhere on the autism spectrum. After exhausting school after school, the family turns to Camp Harmony and the wisdom of self-styled child behavior guru Scott Bean for a solution. What they discover about themselves and their new mentor in the woods of New Hampshire will push them to the very limit.