Vampire's Kiss — Veronica Wolff

As someone who has survived her first year as an Acari recruit, Drew's ultimate goal is to become a Watcher and be paired up with a Vampire agent. Except nothing is as it seems. The vampire Alcántara is as sinister as he is sexy, Ronan is more distant than ever, and it turns out there are other vampires out there. Bad ones. They've captured one of the Watcher vamps and are torturing him for information-and Drew is going undercover to rescue him.

But when their vampire prisoner turns out to be a gorgeous bad boy, Drew's first mission quickly turns into more than she bargained for...