The Templar Legacy by Steve Berry.
Book 1, The Templar Legacy, introduces the series' protagonist Cotton Malone, a former covert operative within the Department of Justice, now retired living life as a book seller and collector. Berry does a decent job with his introduction of a likable, capable, and intelligent former spy with a photographic memory whose retirement career as the owner and operator of a bookstore is useful and believable to the impending story. I was intrigued enough with Cotton Malone, who seemed to be able to hold his own even in retirement, that I'd like to read more about this character.
I enjoyed immensely the history Berry offered within the confines of a good plot of the Knights Templar from their rise and fall, from the knighthood created for the protection of Christian pilgrims to a secret society whose wealth and power rivaled that of the Roman Catholic Church, a fascinating historical legacy shrouded in mystery.
What I did not like, and in fact was appalling and completely unnecessary to the story line which was unraveling a mystery surrounding the Templar Legacy, was the desecration, the all-out attack, fraught with blatant lies and little-held opinion, of the Christian faith, of what is in fact the very foundation of the Christian faith - the Resurrection of Jesus Christ - or in Berry's opinion - it never happened. Thankfully, this is a piece of fiction.
Here's the rub. I enjoyed the writing, the character Cotton Malone, the story line, the history surrounding the Knight's Templar, but was extremely frustrated and confused by Berry's inclusion, unnecessary inclusion, slam of the Christian faith. Thus, I liked the book enough to give Berry some grace and try the next book in the series. Grace where he showed Christians none.