This is a very interesting book that sets the historical context of Turing’s work, and then goes through his famous paper, taking the various paragraphs and explaining them. After covering the paper, the author also goes through the work that directly followed it.
These Turing machines aren’t quite the same design that you see in Computer Science courses. Like all great proofs, the initial idea and proof steps got reworked, simplified and tidied by various other contributors. It’s still an interesting read though, and it’s good good to see what Turing’s original contribution looked like.