<Tr> <Th> Language </Th> <Td> English </Td> </Tr> <Tr> <Th> Genre </Th> <Td> Dark fantasy, science fiction, horror, Western </Td> </Tr> <P> The Dark Tower is a series of eight books written by American author Stephen King that incorporates themes from multiple genres, including dark fantasy, science fantasy, horror, and Western . It describes a "gunslinger" and his quest toward a tower, the nature of which is both physical and metaphorical . The series, and its use of the Dark Tower, expands upon Stephen King's multiverse and in doing so, links together many of his other novels . King has described the series as his magnum opus . In addition to the eight novels of the series proper that comprise 4,250 pages, many of King's other books relate to the story, introducing concepts and characters that come into play as the series progresses . </P> <P> The series was chiefly inspired by the poem "Childe Roland to the Dark Tower Came" by Robert Browning, whose full text was included in the final volume's appendix . In the preface to the revised 2003 edition of The Gunslinger, King also identifies The Lord of the Rings, Arthurian Legend, and The Good, the Bad and the Ugly as inspirations . He identifies Clint Eastwood's "Man with No Name" character as one of the major inspirations for the protagonist, Roland Deschain . King's style of location names in the series, such as Mid-World, and his development of a unique language abstract to our own (High Speech), are also influenced by J.R.R. Tolkien's work . </P>

How many books are in stephen king's dark tower