It tells the story of a nobleman named Alonso Quixano who becomes obsessed with chivalric romances and decides to become a knight-errant, renaming himself Don Quixote. He sets out on a journey with his loyal squire Sancho Panza to right wrongs and defend the honor of his lady love Dulcinea del Toboso. The book explores themes such as reality vs. imagination, madness, and the human condition. The plot revolves around Don Quixote's misadventures and his perception of the world through his distorted view of chivalry. The book is considered one of the greatest works of literature ever written and has had a profound influence on Western culture.

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