This was a quick read but it has lots of info related to Dan Brown's book, The Da Vinci Code, as well as extra things about history that surround some of the things in the book. It was very interesting because there's a lot in this book that doesn't get mentioned due its controversial facts.
I did not get very far in this book. Most of what he was saying was confusing to me and I found it hard to understand. I have not actually read the Da Vinci Code, and I think this book was written assuming you have. It might be easier for someone who has read Dan Brown's book; I don't know.
Now Martin Lunn, an expert historian, reveals the truth behind Dan Brown's research. The reality of Catholic offshoot Opus Dei . . . the hard facts about the bloodline of Christ and King David . . . the origins of the Knights Templar and the infamous Priory of Sion . . . the secrets of Temple Church and Rosslyn Cathedral . . . the real Sauniere . . . the mysteries of Rennes-le-Chateau and much more.
Da Vinci Code Decoded also provides an exhaustive tour of the locations visited by the novel's characters: The Louvre Museum, l'Eglise de Saint-Sulpice and Rue Haxo in Paris; Chateau Villette; Temple Church; Westminster Abbey; Newton's tomb; Chapter House; St. Faith's Chapel; Rosslyn Chapel and many others.