This is a book for those seeking further information, clarification and description of the Second World War at Bletchley Park. It's not a light read by a long shot, but the explanatory insights into the people and the skills employed to break the codes make it worth picking up. A trifle stilted in places, but then this book does not claim to be an easy reading novel, its a book of facts. I like it because it shows not only how the the War was effected by Bletchley Park but because of the in depth descriptions of the various code breakers. Its a fascinating book if you are, like me, overawed and intrigued by these people,their sense of duty, their lives and above all their brains.