The final season continues to build momentum. Tonight, it’s not only Raylan’s investigation that begins to deepen and darken, but also Boyd’s own problems, conflicts and adversaries. These include Mary Steenburgen, who’s having a field day, and so much fun playing against her usual sweet-as-can-be type, portraying Katherine Hale, a woman with an icy heart and a coldly calculating illegal business scheme to match. And wait, that’s not all: Here comes Sam Elliott…