Found in 1 comment on Hacker News
jgrahamc · 2015-04-14 · Original thread
My recommendation when anyone asks this.

1. Alan Turing: The Enigma by Andrew Hodges http://www.amazon.com/Alan-Turing-Enigma-Inspired-Imitation/...

Definitive and detailed biography.

2. Alan M. Turing by Sara Turing http://www.amazon.com/Alan-M-Turing-Centenary-Edition/dp/110...

Deeply personal biography of her dead son.

3. The Annotated Turing by Charles Petzold http://www.amazon.com/Annotated-Turing-Through-Historic-Comp...

Turing's famous 1936 explained in detail.

Fresh book recommendations delivered straight to your inbox every Thursday.