Chosen by blood

the long version

"Five years after the Second Civil War ends, humans and Otherborn--humanlike creatures with superhuman DNA--still struggle for peace. To ensure the continued rights of both, the FBI forms a Para-Ops team with a unique set of skills. Leader of an Otherborn clan, half-breed vampire Knox Devereaux would do anything to find a cure for the anti-vamp vaccine slowly starving his people into extinction. When the FBI contacts him about leading a team of hand-selected Others on a mission to reclaim the stolen antidote, Knox accepts. His new assignment places him in direct contact with Special Agent Felicia Locke, the beautiful human he's craved since their very first meeting..."--P. [4] of cover.