I sneaked in some extra reading time this morning.
Can I finish it today? Maybe.
Although author Berry really lays on the details of history/mythtory, the plot is intricate enough to keep the action moving. At times the background does become intrusive -- and repetitive, especially for someone who has already read Holy Blood, Holy Grail and The DaVinci Code and any number of others on the same theme.
But there are some intriguing twists, enough to keep it interesting.