Cervantes and his manservant have been imprisoned by the Spanish Inquisition, and a manuscript by Cervantes is seized by his fellow inmates, who subject him to a mock trial in order to determine whether the manuscript should be returned. Cervantes' defense is in the form of a play, in which Cervantes takes the role of Alonso Quijano, an old gentleman who has lost his mind and now believes that he should go forth as a knight-errant. Quijano renames himself Don Quixote de La Mancha, and sets out to find adventures with his "squire", Sancho Panza.