Fifteen-year-old Dylan Beachley's family is shattered when his older sister Hannah is kidnapped from their rural New Hampshire home while he slept just one floor away. Weeks of searching by volunteers and local law enforcement provides no clues to Hannah's whereabouts.
Determined to find her after the official search is suspended, Dylan sets out using his extensive knowledge of the forest to search for his sister. He is joined by Molly, an energetic fifteen-year-old who just moved to the area with her drug addict mother and her mother's drug dealing boyfriend. As Dylan and Molly search hundreds of acres surrounding the Appalachian Trail, they must deal with the rugged wilderness, Dylan's grief stricken family, and Molly's abusive home life as the two refuse to give up their goal - Finding Hannah.