The penultimate volume in the Dark Tower series, The Dark Tower VI: Song of Susannah, a #1 New York Times bestseller, is a pivotal installment in the epic saga.Set in a world of extraordinary circumstances, filled with stunning visual imagery and unforgettable characters, the Dark Tower series is unlike anything you have ever read. Here is the penultimate installment.ther and with an alien environment -- "go todash" to Castle Discordia on the border of End-World. In that forsaken place, Mia reveals her origins, her purpose, and her fierce desire to mother whatever creature the two of them have carried to term. Eddie and Roland, meanwhile, tumble into western Maine in the summer of 1977, a world that should be idyllic but isn't. For one thing, it is real, and the bullets are flying. For another, it is inhabited by the author of a novel called 'Salem's Lot, a writer who turns out to be as shocked by them as they are by him. These are the simple vectors of a story rich in complexity and conflict. Its dual climaxes, one at the entrance to a deadly dining establishment and the other appended to the pages of a writer's journal, will leave readers gasping for the saga's final volume (which, Dear Reader, follows soon, say thank ya).