I found this back in the 80's, when good guy vampires were still something relatively new, and loved it. Never managed to find anything else by Killough, in spite of trying (hey, no internet/Amazon back then, if it wasn't on the shelves near you you could probably just forget about it.
I loved the way vampirism is fitted into the normal world of a working detective here. My preferences in any type of urban fantasy have always ran more towards the hidden, something you could easily imagine happening around you in the normal world you live in, not something which requires a different universe (meaning no major uprisings or vampire massacres in downtown, things which would either change the way we see the world completely when they happened or require major work to conceal or disguise as something mundane, rather happenings which could easily slip through the crags and just appear as one of those small news stories somewhere in the back pages about a car crash or how somebody has gone missing, or if something which ends up on the first page still something which would most likely be reported as mundane because the end result looks most like something mundane). This story was just right for me. And the hero is very likable with his struggles when dealing with his new state of being.