When eleven-year-old Dylan Anderson is kidnapped, his subsequent rescue leads to the discovery of fifteen-year-old Ethan Jorgensen, who had gone on a bike ride four years earlier and had never been seen again. Dylan's older sister, Caroline, can't help but wonder what happened to her brother, who has nonverbal autism and is not adjusting well to life back home. There's only one person who knows the truth: Ethan. But Ethan isn't sure how he can help Caroline when he is fighting traumatic memories of his own captivity. Both Caroline and Ethan need a friend, however, and their best option just might be each other.