“黑暗塔”的第三部《荒原》具备了更多西部小说的元素。罗兰的卡-泰特迎来了两位新的成员，众人汇聚在了中世界，开始了共同寻找“黑暗塔”的旅程。
坠入爱河的埃蒂和苏珊娜跟随罗兰踏上了追寻黑暗塔之路。罗兰一心要将他们迅速培训成真正的枪侠，但同时，他自己却因为之前在第三扇门之后拯救杰克，改变了历史而受到双重记忆的困挠，行将崩溃。而杰克也同样因为多出来了一套自己死掉而后跑到一个异世界的记忆而差点发疯，将分裂的一切合而为一的希望寄托在埃蒂与杰克的神秘缘份上。终于，在经历了令人喘不过气来的神秘仪式之后，杰克重新进入中世界，与罗兰一行人会合了。他们结成了牢不可破的“命运组”。一行人来到一座如同荒原一般颓败的废弃之城。杰克突遭绑架，罗兰穿越整个阴森恐怖的荒原将他搭救出来。然后，他们企图搭乘一辆名为布莱因的单轨火车离开这个死亡的文明前往托皮卡，罗兰利用布莱因对谜语的热爱提出了一个猜谜打赌的建议，而赌注则是他们全体的生命……
Several months have passed, and Roland’s two new tet-mates have become proficient gunslingers. Eddie Dean has given up heroin, and Odetta’s two selves have joined, becoming the stronger and more balanced personality of Susannah Dean. But while battling The Pusher in 1977 New York, Roland altered ka by saving the life of Jake Chambers, a boy who—in Roland’s where and when—has already died. Now Roland and Jake exist in different worlds, but they are joined by the same madness: the paradox of double memories. Roland, Susannah, and Eddie must draw Jake into Mid-World then follow the Path of the Beam all the way to the Dark Tower. But nothing is easy in Mid-World. Along the way our tet stumbles into the ruined city of Lud, and are caught between the warring gangs of the Pubes and the Grays. The only way out of Lud is to wake Blaine the Mono, an insane train that has a passion for riddling, and for suicidal journeys.
