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The Treason of Isengard is the seventh volume in Christopher Tolkien's History of Middle-earth and the second in his account of the evolution of The Lord of the Rings. In this book, following the long halt in the darkness of the Mines of Moria with which The Return of the Shadow ended, is traced the great expansion of the tale into new lands and new peoples south and east of the Misty Mountains; the emergence of Lothlorien, of Ents, of the Riders of Rohan, and of Saruman the White in the fortress of Isengard. In brief ...