Shadow Kiss (Vampire Academy, Book 3)
This was probably the best of the series thus far that I have read. The plot really keeps you guessing as to what is going on with Rose, is she crazy? Maybe. Plus, there is a major cliffhanger at the end of this book that makes you want to know what is going to happen next! Thankfully the next book in the series is readily available, just be sure to have it handy as you will want to read it immediately to find out what happens.