School Spirits by Rachel Hawkins

Izzy Brannick is a monster hunter, in fact she is the last in a long line of monster hunters.  When Izzy can't hold it together after her sister disappears, and almost gets killed hunting a vampire, her mother decides that it is time to take a break and face something less scary....high-school.
While Izzy is enrolled at Mary Evans High she is supposed to be looking around for the ghost that almost killed a teacher, but she's also trying to navigate the ins and outs regular high school life, and deal with her first crush.  When the haunting escalates, Izzy must find a balance between trusting her new friends and being a Brannick which means stopping the spirit no matter the cost.

This book is the love-child of Buffy the Vampire Slayer and the TV show Supernatural.  Izzy's fish out of water reaction to normal teenage life, and her friends willingness to accept her flimsy cover stories sometimes are a little hard to buy, but aside from that the characters were all enjoyable.  This book had action, romance, and a lot of humor.  I laughed out loud, and enjoyed the book so much I had to read passages out loud to my fiance.  The book does read a little young, but Izzy is a sheltered (in her own way) 15 year old girl, so that is understandable.  I can't wait for the next book in the series, and now I want to go back and read all the other Hex Hall books.