Stephen King's The Waste Lands

Stephen King's The Waste Lands is the third book in the famous Dark Tower series, of which a new book just came out (oddly enough, it is a mid-quel, taking place between the fourth and fifth books), and yes, it does take its name from that famous T.S. Elliot poem. Having Roland, Eddie, and the new idea of Odetta, named Susannah, our characters are firmly developed -- or are they? The Waste Lands reintroduces Jake, a character prominently featured in The Gunslinger and who made a small appearance in The Drawing of The Three. It's got much more going on than The Drawing of the Three, though probably not as much as The Gunslinger.
Here, our characters face many challenges that range from jumping from world to world to fending off tribal freaks of nature in a city like New York called Lud. The ending is a very extreme cliffhanger, starring Blaine the Mono, a psychotic train obsessed with riddles and wordplay. It's a more entertaining book than The Drawing of The Three, I think, but with less intellectual content. Go check it out if you've got the time.