Query: The Dark Tower (series) novels
Relevant documents:
The Dark Tower II: The Drawing of the Three
The Dark Tower IV: Wizard and Glass
The Dark Tower III: The Waste Lands
The Dark Tower V: Wolves of the Calla
The Dark Tower VI: Song of Susannah
The Dark Tower VII: The Dark Tower
The Dark Tower: The Wind Through the Keyhole
The Little Sisters of Eluria
The Dark Tower: The Gunslinger