Ok, well, I don't usually review books, but I'd like to explain my one star.
The back cover, wittingly presents the book as a Dan Brown clone/substitute. Technically, that's true, since we have (also taken from the back cover) "an ancient scroll, black magic worshippers, a map to three hidden labyrinths throughout Europe, ravaged by war". Well, yes, we deal with material engaging enough. But in essence, in order for this book (or any book) to fit in the "Dan Brown genre", I think it should also have a similar pace, engaging dialogues, engaging and fitting back-story.
Well, when reading about people dropping books at page 100 or 50 or even 30 I find them really annoying and quick to judge. I kinda changed my mind. I didn't drop the book, I never have and I'm not about to begin doing so, but trying to finish this book became an ordeal.
Semi-spoilers start now, with very rough approximation of page/story correspondence.
So, the protagonist receives a medieval scroll, which sends him on a journey. Fair enough. After quite some delay, the journey begins in page 100 and he reaches the -real- destination in page 200. In page 300 we get a glimpse of what the destination may mean. In other words, we are halfway the book, still trying to get a grip on the story, which moves slower than a snail.
The book, after all, is not really about the historical/thriller element completely, but explains rather in full detail, the hero's past about the Spanish War, the current state of affairs, like the death of Stalin, and other info on World War 2. That's also acceptable, but I remind that the back of the book only said "a Europe ravaged by war". It didn't say that the book also tried to fit in the history genre as well. If I wanted SO many info about the 20's-40's wars I would have picked up a genuine history book. I repeat, it's not that it was inaccurate, it's the fact that the reader isn't informed of what he's about to embark on.
The writing wasn't bad per se, but the details and parentheses were excruciatingly many. An example (in my own words):
"They rent a hot-air balloon. The owner was middle aged. He was from X town. His wife was back home tending the garden and he was at the other side of the country doing this..."
And this happens almost with every person, relevant or irrelevant to the story. It is too much information to the reader, and it really doesn't add anything, on the contrary, it subtracts from the pace of the book.
In a nutshell, this book is first and foremost the personal history and background of the protagonist (wars, past enemies, current relationships, etc) sprinkled with a bit of the supposed "map/secrets/and whatnot". If it was marketed as such, maybe I would know what to expect and would have liked it more, or maybe I wouldn't have picked it up in the first place.