Abstract: (From biography to autobiographical fiction. Cervantes in Algiers) The life of Miguel de Cervantes has made rivers of ink flow. More than four centuries after his death, information about him continues to appear that seeks to fill gaps and shed light on shadows, such as those that loom over his experience in captivity in Algiers (1575-1580) or those hidden in his work immortal Don Quixote. The light of the night is the last artistic experience that peers into the abyss of his existence. This dramatic monologue of autobiographical fiction, written in verse, as in the Cervantes era, and recently published in the work Cervantes in Algiers (Antonio Bueno, Comares, 2024) in multilingual format (translated into eight languages) and multimedia (written and audiovisual), complements another monologue inserted in the same work, Captive in Algiers, which is intended this time to be autobiographical. It will be shown that the border between biography - made by a third party and submitted to one's own personal voice - and fiction (autobiographical) - a story by a third person put into the mouth of the protagonist of the story - is really subtle, and that both contain a truth, objective and subjective, of the subject that seeks to be complementary. As in Cervantes' own work, the miracle will occur through art and literature.