My brother recommended The Historian to me. It's basically a modern Dracula story and it's really well done. Kostova tells a complex story, narrated through multiple timelines and points of view (much of the story in the mode of letters read by the narrator) and she does a very enjoyable job tying everything together. It's a fun, modern detective story weaving through the world of Dracula (this is NOT a vampire story, but rather a Dracula story). It was a great, fun read, great writing, not too deep, but a complex story. It got a little slow at parts, but I enjoyed it quite a bit.
This is a great book for someone who enjoys complex stories and realistic monster stories.