Daniel Keyes wrote science fiction and non-fiction about intelligence, identity and the way people understand themselves. Flowers for Algernon follows Charlie Gordon, a man with an intellectual disability who undergoes an experimental procedure that rapidly increases his intelligence. Told through Charlie's progress reports, the novel changes in language and complexity as his abilities grow and then forces him to confront what the experiment may ultimately cost. Keyes also wrote The Minds of Billy Milligan, a non-fiction account of a man diagnosed with multiple personality disorder after being charged with serious crimes. His writing is accessible and strongly focused on one central psychological or scientific question rather than elaborate world-building. Flowers for Algernon fits classic science fiction, psychological fiction and ethical speculative fiction. Read more Less