If you want to see Turing in a more nuanced light, this book is highly recommended.
There's a slight digression at the beginning about the Turing family. I guess that's expected given the author, but it feels unjustified. This book also shows nuance about Turing's role during the war, something that's probably covered by other biographies, but might bear repeating. My favourite part was the stuff related to artificial intelligence, something that Turing began talking about. Some of his theoretical work is overlooked, but maybe that's not the intention of this book.