The Dark Tower is based on the seven novels that collectively make up the The Dark Tower series, written by Stephen King. The first is called The Gunslinger, followed by The Drawing of the Three, The Waste Lands, Wizard and Glass, Wolves of the Calla, Song of Susannah, and The Dark Tower. Stephen King recently announced an eighth book, The Wind in the Keyhole, to be set between Wizard and Glass and Wolves of the Calla. There is also a short story involving Roland entitled "The Little Sisters of Eluria."
