Over the past decade Appalachian-set thrillers have had a rough go of it. 2015’s “The World Made Straight,” “Them That Follow” (2019), they lacked substance. The Ron Howard-directed “Hillbilly Elegy” and “Devil’s Peak” by Ben Young were misguided efforts whose superior casts did not fulfill their promise. This year thankfully brings us Eshom and Ian Nelms’s “Red Right Hand”, a well-directed Kentucky-based crime film that