This was a cute story that certainly wasn't what I was expecting. It combined a lot of fun things I really enjoy reading about, like time travel and history, with twists on established ideas like vampires that didn't make me want to cringe. The treatment of the infamous crystal skulls is better than whatever Indiana Jones did, and the vampires are given an interesting twist that doesn't shy away from some of their grosser aspects.
There were times it felt like it dragged a little, especially since some of the stuff they did the reader already knew they had to do because of Time Travel Reasons. They probably could have been glossed over or just summarized. But overall I thought it was well written, and it had a lot of good metaphors and descriptions too.