This is the first of the Ethan Gage books that I have read. It is pretty obvious it comes out of the USA as the hero is an American loveable rogue. It is a bit like Indiana Jones set in Napoleonic Times.
The story continues from Napoleons Pyramid, and refers back to what happened in that adventure a lot. So I don't feel you have to have read that book to know what is going on, though by doing so you would have a greater insight to his arch enemy. Historically, what is going on in the story is truthful. Such as Napoleons attack on Jaffa and his attack on Acre. Although a few inclusions have been put in, much like Bernard Cornwell did in the Holy Grail series of books.
Our gambling, womanising hero who can it seems escape from more or less any situation keeps the story going at a fair pace of knots.
I personally am not a great fan of books written in the third person, but this was a really enjoyable easy read. If you like swashbuckling at a fast pace this is the book for you. I do, so I loved it.