A bit of a letdown,
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This review is from: The Jerusalem Puzzle (Paperback)
I don't know whether it will be fair to publish this review, because I read it, and 'The Istanbul Puzzle' in the shadow of the Simon Toyne trilogy - 'Sanctus', 'The Key' and 'The Tower' - all of which were closer to being page-turners.
I can say, though it is easy to read and I can't say anything negative about it.