On a six-mile hike on the Maine-New Hampshire branch of the Appalachian Trail, nine-year-old Trisha McFarland quickly tires of the constant bickering between her older brother, Pete, and her recently divorced mother. But when she wanders off by herself, and then tries to catch up by attempting a shortcut, she becomes lost in a wilderness maze full of peril and terror.

As night falls, Trisha has only her ingenuity as a defense against the elements, and only her courage and faith to withstand her mounting fears. For solace she tunes her Walkman to broadcasts of Boston Red Sox baseball games and follows the gritty performances of her hero, relief pitcher Tom Gordon. And when her radio's reception begins to fade, Trisha imagines that Tom Gordon is with her -- protecting her from an all-too-real enemy who has left a trail of slaughtered animals and mangled trees in the dense, dark woods.