Diabolical Streak — Mercedes Lackey

Welcome back to the world of Reboots -- a world where zombies, vampires and werewolves live side by side with humans and eke out whatever existence they can, doing whatever jobs they can including space travel where they make the perfect crew members given their lack of normal needs.

Humph and his friends Fred the werewolf and Skinny Jim the zombie have found a new home on the planet Mildred, a nice little mid-sized industrial world (named, apparently, after a drunken captain's girlfriend). Humph runs a successful private investigation agency solving petty crimes, which pays the bills nicely, until he takes on a case to find the missing heir to a secretive company.

But this is no ordinary case, and he is caught in a set-up that will spell doom for both himself and his ward…unless he can out-think and out-run an insidious enemy who will do anything to stop him.