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By the author of two New York Times bestsellers, a heartwrenching and tense drama about a troubled family, who give up everything to join an experimental 'family camp' - with life-changing consequences.

How far will a mother go to save her family? The Hammond family is living in Washington DC, where everything seems to be going just fine, until it becomes clear that the oldest daughter, Tilly - a mix of off-the-charts genius and social incompetence - is on the autistic spectrum. Once Tilly is kicked out of the last school in the area, her mother Alexandra is at her wits' end. The family turns to Camp Harmony and the wisdom of child behaviour guru Scott Bean for a solution. But what they discover in the woods of New Hampshire will push them to the very limit.

Told from the alternating perspectives of Alexandra and her younger daughter, eleven-year-old Iris, this is an unputdownable story about the strength of love, the bonds of family, and how you survive the unthinkable.