The Historian. If you want a GOOD vampire book, this is it. It's all about history, and really, the only vampire mentioned is Vlad the Impaler. I love history, especially creepy, horrifying history like the true story of Vlad.
The Historian by Elizabeth Kostova. A completely engrossing, eerie story that tumbles through timelines, telling the stories of a professor, his mentor, and the infamous Vlad the Impaler. (Paired with Relic Ritual Red 2009)