Roland and his tet have just returned to the path of the Beam when they discover that they are being followed by a group of inexperienced trackers. The trackers are from the town of Calla Bryn Sturgis, and they desperately need the help of gunslingers. Once every generation, a band of masked riders known as the Wolves gallop out of the dark land of Thunderclap to steal one half of all the twins born in the Callas. When the children are returned, they...

While Jake, Father Callahan, and Oy struggle to free Susannah Dean, whose body is possessed by a demon-mother named Mia, Roland and Eddie find themselves swept by magic to East Stoneham, Maine, in the summer of 1977.