Stephen King - The Dark Tower IV: Wizard And Glass is the fourth book in the Dark Tower series. The Dark Tower IV: Wizard & Glass by Stephen King was first published in 1997.
The Dark Tower IV: Wizard And Glass - Stephen King book description:
Roland the Gunslinger and his followers have to contend with a sentient monorail intent on killing itself and taking them with it.
While seeking to return to the Path of the Beam that will lead them to the Dark Tower, Roland tells his friends a story about the tragic loss of his first love, Susan Delgado.