I've read plenty of these 'action and adventure' type novels and I can only praise David Gibbins for the huge amount of research he must have put into producing this piece of work. Top marks in that respect. However, I found the plot a bit too 'wordy' and not quite enough action in parts. Maybe that's just me being a little too picky having read authors such as Scott Mariani and Andy McDermott. On a positive note, I particularly enjoyed the inclusion of Bletchley Park during the war years and Alan Turing's cameo. On the whole an enjoyable, if not overly long read. I received an advance reader copy in return for an honest review.