Cliff St. James is now only a part-time PI and spends the whole book with his regular job as a homicide detective. This is not Law & Order or CSI though! Those cops don't carry knifes behind their fly! He isn't afraid to ignore the rules and can take on several dangerous gangster with just one knife.
St. James investigates a few strange ritualistic killings that force him to face his fears of the occult. He gets involved with hookers, Mexican criminals and several sorcerers.
Don't worry about the occult part. It gives a nice little atmosphere to the book but it never becomes horror / urban fantasy.
If you've read the other books in this series you will be happy to know there's a bit of a resolution to the subplot of his relationship with Honey Baybee, his fellow cop. You will also appreciate how the previous stories have landed St. James in quite a comfortable state financially, his dojo now a big hit.
I have a feeling St. James' status will be shifting again in the next book as I think there might be a bright CIA future for him in store. I will be sure to read it and find out...