Bloodlines — Richelle Mead

LOVE AND LOYALTY RUN DEEPER THAN BLOOD…

Sydney protects vampire secrets -- and human lives. As an alchemist, she is part of a secret group who dabbles in magic and serves to bridge the world of humans and vampires.

But when Sydney is torn from her bed in the middle of the night, she fears she's still being punished for her complicated alliance with dhampir Rose Hathaway. What unfolds is far worse. Jill Dragomir -- the sister of Moroi Queen Lissa Dragomir -- is in mortal danger, and goes into hiding. Now Sydney must act as Jill's protector.

The last thing Sydney wants is to be accused of sympathizing with vampires. And now she has to live with one . . .