Retribution (Anna Strong, Vampire Series #5)

With her partner out of town, her family abroad, and her mentor estranged, newly-turned vampire Anna Strong is keeping a low profile.

But now young vampires are turning up dead, completely drained of their life force. And though Anna wants to say no when Williams, her former teacher and now leader of a supernatural enforcement squad, asks for her help, she can?t. But soon, she'll wish she did.