Fourteen-year-old Emily is drawn to the treehouse in the backyard of her family's new home. That's how she meets her next-door neighbor, Rowan, who has been using it as a refuge, where she carves wooden animals and stays clear of her difficult father. Shy, imaginative Rowan is like no friend Emily has ever had. They get along—and begin to change each other's lives—because of what they don't tell each other, as well as what they do. For Emily has her own secrets, too. And some friendships have unspoken rules—rules that you have to follow even if your friend might not be safe...