The Discreet Eliminators series - The Pale House Devil

A gripping, snappy creature feature from the master of horror noir about two detectives—one dead, one living—hired by an embittered old landowner to banish a bloody cosmic monster from his ancestral home, perfect for fans of Cassandra Khaw, Charles Stross and Lucy A. Snyder.
Ford and Neuland are paranormal mercenaries—one living, one undead; one kills the undead, the other kills the living. Heading west to look for work and wait for the heat from their last job to cool down.
There Tilda, a young woman, hires them to track and kill a demon haunting a mansion in remote northern California for wealthy landowner, Shepherd Mansfield.
As Ford and Neuland investigate the creature they uncover a legacy of blood, sacrifice and slavery in the house. Forced to confront a powerful creature unlike anything they've faced before, they come to learn the biggest monster in this story might just be the person paying them.