Samuel and Martha move to Norway to live with their Aunt Edna following the death of their parents and are drawn to the attic and the Shadow Forest behind the house inspite of their aunt's warning to stay away from them.
Accompanied by his aunt's Norwegian elkhound, Ibsen, twelve-year-old Samuel ventures into a weird forest filled with strange and dangerous creatures to rescue his younger sister, Martha, who has been mute since their parents' recent death.