Contract of Crimson

Kaelen Vance isn't a warrior; he's a loophole in human form. As a mortal consultant to the supernatural, his mind is his only weapon in a world of fangs and spells. When he's hired to solve a series of impossible murders targeting ancient vampire nobility, he's thrown into the orbit of Lady Seraphina, a centuries-old vampire bound by archaic laws. The killer is exploiting the vampires' most sacred vow, and only Kaelen can see the flaw. To survive, they must bridge the chasm between their worlds, unaware that their investigation will unearth a conspiracy threatening to drown the city in blood.