The long way down by Craig Schaefer is currently 99p at Amazon UK with the Audible whispersync £2.99
Link here
I like the narrator, Adam Verner, and I like Urban Fantasy so a good deal in my book.
I think there is also an offer on this in the USA as I actually bought the whispersync from Audible.com for $2.69
The blurb
Nobody knows the seedy underbelly of Las Vegas like Daniel Faust, a sorcerer for hire and ex-gangster who uses black magic and bullets to solve his clients' problems. When an old man comes seeking vengeance for his murdered granddaughter, what looks like a simple job quickly spirals out of control.
Soon Daniel stands in the crossfire between a murderous porn director; a corrupt cop with a quick trigger finger; and his own former employer, a racket boss who isn't entirely human. Then there's Caitlin: brilliant, beautiful, and the lethal right hand of a demon prince.
A man named Faust should know what happens when you rub shoulders with demons. Still Daniel can't resist being drawn to Caitlin's flame as they race to unlock the secret of the Etruscan Box, a relic that people all over town are dying - and killing - to get their hands on. As the bodies drop and the double-crosses pile up, Daniel will need every shred of his wits, courage, and sheer ruthlessness just to survive.
Daniel Faust knew he was standing with one foot over the brink of hell. He's about to find out just how far he can fall.