Spirit Bound: A Vampire Academy Novel by Richelle Mead

What's on the back of the book:
Rose Hathaway has been outrunning death ever since she swore to be the protector of her best friend, Lissa, no matter what.

She's finally made it back to the haven of St Vladimir's but with Dimitri, the boy she once loved, stalking her, Rose can only run so far.

She failed to kill him when she had the chance, and now her worst fears are about to come true. Dimitri has tasted her blood, and she knows in her heart that he is hunting her. And if Rose won't join him, he won't rest until he has silenced her . . . forever.

A piece from the book:
My dearest Rose,
One of the few downsides to being awakened is that we no longer require sleep; therefore we also no longer dream. It's a shame, because if I could dream, I know I'd dream about you. I'd dream about the way you smell and how your dark hair feels like silk between my fingers. I'd dream about the smoothness of your skin and the fierceness of you lips when we kiss.
Without dreams, I have to be content with my own imagination - which is almost as good. I can picture all of those things perfectly, as well as how it'll be when I take your life from this world. It's something I regret having to do, but you've made my choice inevitable. Your refusal to join me in eternal life and love leaves no other course of action, and I can't allow someone as dangerous as you to live. Besides, even if I forced your awakening, you now have so many enemies among the Strigoi that one of them would kill you. If you must die, it'll be by my hand. No one else's.
Nonetheless, I wish you well today as you take your trials - not that you need any luck. If they're actually making you take them, it's a waste of everyone's time. You're the best in that group, and by this evening you'll wear your promise mark. Of course, that means you'll be all that much more of a challenge when we meet again - which I'll definitely enjoy.
And we will be meeting again. With graduation, you'll be turned out of the Academy, and once you're outside the wards, I'll find you. There is no place in this world you can hide from me. I'm watching.
Love,
Dimitri