Even Vampires get the Blues ~ Katie MacAlister

This is the fourth book in the Dark Ones series. In this novel, Paen, a Dark One, has been contacted about fulfilling a contract that his father agreed to two hundred and fifty years earlier. He must find and return a statue to the demon the contract was with. In trying to fulfill this contract, Paen hires Samantha Cosse, a half-elf private detective, to aide him in the search. it is quickly discovered that Samantha is his Beloved, though not nearly as accepted. This is a pretty good story, with several twists and turns that really surprised me.