Death Hears a Siren

Norma never chose to be a vampire, but she enjoys her undead life. She runs a profitable cleaning service which assists Seattle's paranormal community by straightening untidy interactions with humans or each other. She loves her work. She and her sole employee, Carlos, have a good rapport. (It helps both vampires and zombies have an affinity for a high protein/low carb diet.) 
When three witches on vacation find a dead siren in their houseboat, Norma is called in to clean up the body no questions asked. When the mermaid's family shows up, things really get messy.
 
Paperback
Fiction, Cozy Mystery