Chosen - P. C. Cast, Kristin Cast

Chosen is the third book in the House of Night series.  This series is like a Saturday serial.  Each book is sort of a cliff hanger and you just have to keep reading.  At least they're worth reading.  Zoe manages to alienate her friends and loose all three of her boyfriends this time.  One fatally.  She's getting stronger but still need some maturity to go with that strength.  The House of Night school is almost under siege because two vampyres have been...well read the book.  Highly recommended.