Plagued by apocalyptic visions of a dying universe, 12-year-old Jake Chambers discovers he can cross between worlds. He finds Roland Deschain, the last Gunslinger, a hardened warrior on an obsessive quest to kill the Man in Black—the sorcerer who destroyed everything he loved. But the Man in Black serves the Crimson King, a godlike entity seeking to topple the Dark Tower, the nexus of all realities. As Roland and Jake journey across the desolate Mid-World, Jake’s psychic “shine” proves vital to stopping the King’s plan. But when Jake is captured to be used as a battery for the Crimson King’s final assault, Roland faces an impossible choice: pursue his revenge or save the boy who reminds him of his lost humanity.