Andrew Hodges' 1983 biography "Alan Turing: The Enigma" is widely considered the definitive account of Alan Turing's life and work. The book provides a richly detailed examination of Turing's groundbreaking contributions to computer science and his codebreaking work during World War 2 that helped end the war. It also offers profound insights into Turing's humanity and a nuanced exploration of the centrality of his sexual identity. Reviews praised Hodges, a mathematician himself, for his ability to clearly explain Turing's complex intellectual achievements and empathetically depict the personal relationships and tragic circumstances of Turing's life.