Like Dan Brown, Neville uses a few historical facts and events to base her story on. If you liked "Code" you'll probably go for this one too. It's a multi-level story of the hunt for Charlemagne's Chess set, which according to legend has magical powers. So pull up a beer (or iced tea) and some chips, it's gobnna be a long evening's entertainment.
This is a most excellent engrossing book. One of my very favorite. The two time periods and European history, chess tournaments, puzzles and codes, long before The DaVinci code.
Could not put this book down....the stories intertwined were magnificent. A few challenges to logic were obvious, but the story overcame those. It's a large book so plan your time accordingly.