Neat, Clean, Shaved & Sober—but I haven't kept it up, but always mean to restart it!).
Stephen Gallagher, who wrote Dr. Who novelizations
and other medical/tech thriller-style works, captures that American milieu of cop shops,
trailer parks, and skid-row motels and its language well, which isn't
that easy (I don't believe Clive Barker quite ever mastered it, and I
don't know if James Herbert even ever tried). Gallagher well follows all the detective first-person hallmarks: the hard-boiled insights, the trouble with women, the observations of those he meets and the places they live, and the dogged pursuit of lowlifes. Except this particular lowlife happens to be a body-hopping supernatural being spreading death and mayhem wherever he goes for as long as the being can remember.
Progeny of the Adder (1965), Falling Angel (1978), or Red Dragon (1981). The ending I admit is disturbing, a bit of vengeance hinted at on this cover of the 1988 New English Library paperback, but again, too little too late. It's a bit of a struggle to even write this review!