Cervantes's great novel Don Quixote is a diptych, the first part of which was published in 1605 and the second in 1615. Focusing almost entirely on the novel's second part, Henry W. Sullivan is the first critic to offer a systematic account of Don Quixote's passage from madness to sanity. Sullivan argues that Part II of the novel is a salvation epic, within which the Cave of Montesinos episode is the single most important pivot in the Knight's...