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Looks like he has written two with that name, or is that just Amazon with two different versions?

The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography

And The Code Book: The Secrets Behind Codebreaking

Guessing the second one has more to do with Bletchley Park

I know the first one covers the Enigma, haven't heard of the second one before.

It looks like the second one is the young adult adaptation of the first one.

Oops, I didn't catch that when I posted. Hard to read small print on a phone. I'll pick up the first one!

The first one is the one I've read and recommend. I haven't seen the second one before.