Beat the Reaper by Josh Bazell
This book is not for persons with weak stomachs. It is very graphic and tells a unique story about a man, Pietro “Bearclaw” Brnwna, who finds his grandparents’ murdered bodies in their home and vows revenge on their deaths. Ironically, the killers were in the mafia and he becomes a hitman for the family that takes him in. Unfortunately, he pisses off his adoptive family and goes into the witness protection system and eventually becomes a doctor.
An unusual story that when you get past the violence, is a real page turner.