Four stars, but a high four stars. I enjoyed this one quite a lot, though there were a few things lacking.
I had never heard of this book until I came across an AMA where Mike Carey (aka M.R. Carey) mentioned, very much in passing, that he had written a couple of books under a pseudonym (so we can add aka Adam Blake). He didn't seem especially proud of them, and notably commented that he had nothing to do with the book titles or blurbs, and that was it. Being, currently, in a bit of a Carey kick in my reading, I looked for the two books and found them, used, for pretty cheap, so gave them a shot.
This book initially comes across as a bit of a Dan Brown type of book, but with Carey's writing style. That said, I genuinely enjoyed it much more than any of the 2 or 3 Dan Brown books that I've read, and it is MUCH more grounded. Nothing as ridiculous as Brown does, no Vatican with jets that fly faster than anything in the real world, no excessively over the top secret societies (minor spoiler: I'm not saying that there isn't one present here, just that it is much more restrained). The characters have more depth and aren't just caricatures (or not anywhere near to the same degree, anyway).
All of that said, it definitely does feel more like Carey maybe got hired to do his version of a DaVinci Code type of story, and the majority of the plot, roles of characters, and more action-oriented storytelling follow those types of stylistic elements... and Carey makes it entertaining.
Overall, I enjoyed it, and it was well-written but also a pretty light read.
Unfortunately, there were some downsides here.
As is typical of Carey, we spend a long time getting to the end, and then it just happens really quickly, and ends up (not always the case, but it is in a few of his works) leaving you a bit disappointed and underwhelmed. A lot of build up for an ending that resolves things a little too quickly and cleanly.
Additionally, the big background thing that is the (macguffin) secret is just... not really a big deal, or much of a secret. If we go back to the DaVinci Code, it's really about keeping what REALLY happened with Jesus secret, lest there be societal repercussions. Here, the big secret just isn't that major, despite the front and back cover blurbs, and there's a real world version of it that no one really cares about, and... the book just seems to go on its own momentum, and you don't really care about the big background in it, or the little twist (or two).
Despite that, I still really enjoyed the read, and still think it deserves the 4 stars.
Looking forward to the next book under this pseudonym, and a bit bummed that we didn't get to see the same evolution as Carey has had as a written applied to the Adam Blake style of Biblical adventure books.
Oh yeah, the title? The blurbs on the back and front covers? They really are bad, and really have virtually nothing to do with the actual book. Whoever came up with them either didn't actually read all the way to the end of the book, or just wanted to get airport bookstore sales.