Angels' Blood (Guild Hunter, #1)

"Vampire hunter Elena Deveraux knows she is the best--but she does not know if even she is good enough for this job. Hired by the dangerously beautiful archangel Raphael, a being so lethal that no mortal wants his attention. Elena knows failure is not an option--even if the task is impossible. Because this time, it's not a wayward vamp she has to trick. It's an archangel gone bad. The job will put Elena in the midst of a killing spree like no other--and pull her to the razor's edge of passion..."--p.[4] of cover.