The Way of Escape — Kristen Reed

When the leader of a vampire coven tells Clara Robinson that she's a dhampir, he gives her an impossible choice: Keep her mortality and live as a slave or become a vampire be free. A vampire visiting the coven complicates matters by revealing that she can liberate all of the slaves by parting with her humanity and becoming a vampire. This news forces Clara to examine her faith and decide if she should risk her eternal soul to save the humans or give up her freedom to serve by their side.