The book itself was pretty good but not great. It seemed very cliched although it probably would have been better to read it when it first came out. Mengele seemed the wrong sort of evil to what the actual man was like (too much of a bond villan). It was an enjoyable read though and kept the reader interested throughout, if a little let down by the end.
My main reason for writing a review is the terrible introduction in this edition. It gives away key plot points, including the ending. Don't read it before the actual book, I may have enjoyed it more if I couldn't see the ending coming based on that intro.