Flowers for Algernon by Daniel Keyes book PDF download free in just one click. Flowers for Algernon is a science fiction novel by Daniel Keyes, which tells the story of Charlie Gordon, a mentally disabled man who undergoes an experimental surgery to increase his intelligence. The novel is based on a short story that won the Hugo Award in 1960 and was later expanded into a full-length novel that won the Nebula Award in 1966. The novel explores the themes of intelligence, identity, ethics, and human nature.