How to Murder a Corpse

I'm a private investigator and most of my clients are monsters. Which makes sense, since I'm the only PI around who's also a licensed necromancer. But when a fabulously beautiful dame walks into my office and says she needs protection from her mobster boyfriend, it only proves I'm  licensed chump, too. Then I find a zombie in my office, a dead zombie with a bullet in his brain and bite marks on his neck.
What kind of vampire attacks a zombie, and who'd want to kill somebody who's already dead? That's the kind of case I take. Monsters. Zombies. Vampires. Ugly cases, but they pay. Just don't call me about your divorce. I don't do divorces.