“The Little Sisters of Eluria” is a prequel to the first volume of the Dark Tower saga. Roland’s beloved city of Gilead has fallen to the Good Man’s forces, and the Gunslingers have been slaughtered at the Battle of Jericho Hill. Roland is now a lone wanderer, searching for the trail of the elusive sorcerer known as the Man in Black. On a hot day during the season of Full Earth, Roland enters a deserted town in the Desatoya Mountains. The town is called Eluria, and it is empty except for a lame dog, a drowned boy, and the eerie sound of tinkling silver bells. As Roland searches for the town’s missing inhabitants, he is attacked by the slow mutants known as the Green Folk. Our unconscious hero is rescued by an itinerant band of female healers who call themselves the Little Sisters of Eluria. But Roland’s rescuers are not what they seem, and our gunslinger must fight their narcotic potions to stay awake, and alive.