A Story Within A Story, Within A Story... As His Progress Along The Path Of The Beam Is Halted By A Ferocious Storm, Roland Deschain, Mid-world's Last Gunslinger, Tells A Tale From His Teenage Years. Sent By His Father To Investigate Evidence Of A Murderous Shape Shifter, Roland Takes Charge Of The Terrified Boy Who Is The Sole Surviving Witness To The Beast's Most Recent Slaughter. The Only Thing Which Seems To Calm The Boy Is A Story His Mother Used To Read To Him At Bedtime, 'the Wind Through The Keyhole'. A Stand-alone Novel Complimenting The Seven Books In The Dark Tower Series.