The Dark Tower is a series of seven books (heptalogy) written by American author Stephen King between 1970 and 2004.
More Info: http://en.wikipedia.org/wiki/The_Dark_Tower_(series)
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Stephen_King_-_The_Dark_Tower_I_-_The_Gunslinger.pdf
Stephen_King_-_The_Dark_Tower_II_-_The_Drawing_of_The_Three.pdf
Stephen_King_-_Dark_Tower_III_-_The_Waste_Lands.pdf
Stephen_King_-_The_Dark_Tower_IV_-_Wizard_and_Glass.pdf
Stephen_King_-_The_Dark_Tower_V_-_Wolves_of_the_Calla.pdf
Stephen_King_-_The_Dark_Tower_VI_-_Song_of_Susannah.pdf
Stephen_King_-_The_Dark_Tower_VII_-_The_Dark_Tower.pdf