A coming-of-age story with a wicked twist, “TRESTLE” reaches into the depths of a nation and asks what lies beneath. The story, which unfolds largely in flashback, opens with Dalton Chance — a local boy who once dreamed of going to college — making shadow puppets against the walls of a prison cell. Dalton is a suspected of killing his friend, Pace Creagan, a rebellious girl who challenged him to run the trestle.