The new Diane Lane-Kevin Costner movie Let Him Go is the kind of old-fashioned entertainment that Hollywood rarely makes anymore, which is a shame, because this well-crafted thriller aimed at adults is the best studio movie I've seen in months. After playing Clark Kent's parents in Man of Steel, Lane and Costner reunite here as another wholesome duo, Margaret and George Blackledge, who live quiet lives on a Montana ranch — until that peaceful existence is shattered by the tragic death of their adult son James, who leaves behind a wife, Lorna (Kayli Carter), as well …