Instruct: Classify a review into positive or negative sentiment.
Query: hard reading, a sad, depressing story

I loved the first three Dark Tower books. Wizard and Glass is well written, but I don't enjoy reading depressing books, nor books where I know one of my favorite characters is doomed to die horribly. If you paid attention to clues in the first three books, you know exactly how this book ends--and it ain't nice.Wizard in Glass is 90 percent prehistory and like all prequels it suffers because the reader knows what's going to happen. It's like watching the prequel Star Wars movies knowing that Anakin Skywalker is inevitably going to become Dark Vader (Wizard and Glass is waaaaay better written than those movies, however).This book fleshes out and enriches Roland's character, ultimately making him better for it, but I found myself flipping pages (tapping, I suppose, on my Kindle) to get through it. It took weeks of forced reading to get through. The first three Dark Tower books I could not put down.I'm on to book 5, hoping the momentum of the story returns.