Rhona Mitra (pictured inside; Doomsday, Skinwalkers, Underworld: Rise of the Lycans) has boarded the indie thriller The Boy in the Box for A2 Entertainment Group and Code Entertainment. She joins Josh Lucas and Jon Hamm in the film about a small-town police chief (Hamm) determined to discover the truth behind the mummified remains of a boy who was murdered a half-century earlier. Anders Anderson is directing from a screenplay by Glenn Taranto. James Van Der Beek, Marcus Thomas, Jimmy Bennett and Jessica Chastain also have been cast. Mitra plays the police chief’s wife, who is trying to move on after the disappearance of their own son eight years earlier. Lucas plays the father of the murdered boy.