Diana Bishop is a modern-day witch who has spent the majority of her life ignoring her powers (for the most part). One day, she calls up a book with a mysterious enchantment on it and finds herself in the middle of a war between other witches, vampires, and daemons. Reminded me of both "Twilight" for the forbidden love aspect, though much more complex and MUCH better written, and "The historian," though less esoteric. Wonderful story, great characters. I was so disappointed when it was finally over. All I'm going to say it this better be the first in a series!

Edit: Did I really not know this was the first in a trilogy when I first read it? Odd. Re-read as the 3rd and final book comes out next week. Surprisingly enjoyed it just as much the second time around.

Another edit: Still loved this the third time around :-)