"In "Flowers for Algernon" by Daniel Keyes, Charlie reads a variety of books throughout the course of the story, as his intelligence gradually increases. Some of the books he reads include "Robinson Crusoe" by Daniel Defoe, "Gulliver's Travels" by Jonathan Swift, and "Paradise Lost" by John Milton. He also reads books on psychology and science in order to better understand his own condition and the nature of intelligence."