Los Angeles, a city where monsters live cheek by jowl with humans. A city where violence simmers just below the surface. Lieutenant Christine Humber of the LAPD's robbery homicide division is well aware of that violence. She has worked for years in the city's most violent district, known locally as Monster Central.

When called to a murder scene, Chris and her partner learn that the victim is a shifter--a werewolf--and he died hard. Chris soon realises that she has a very special serial killer loose in her city, one that is taking down Monster Central's bad boys one by one. Who or what can kill a werewolf and leave no trace? Chris and her partner race to find out.