Andy Rausch 
Savage Brooklyn [EPUB ebook] 

After small-time mobster Joe D’Amato gets attacked by a werewolf, his life takes a dark turn, and he begins a transformation towards a new, twisted life.
As corpses start piling up, two cops suspect there is something unnatural on the loose, and they have a suspect. When nobody listens to their theories, they go rogue and start digging for clues.
Soon, forces both natural and supernatural clash, and all hell breaks loose.
This book contains graphic sex and violence, and is not suitable for readers under the age of 18.