Kincaid and Maddox
I am new at dark romance, and I am definitely not into masochism, hence the 4*, but I can appreciate the amazing work this story is.
Maddox works for Vancini Mafia. He actually is a Vancini though illegitimate. However, that doesn't hinder his power within the family.
The boss of the Vancini family, his father, fears him, as does his heir, Maddox half brother. And he revels in it.
He is the most feared man in the mafia and has no weakness. Until he mets her.
Fantastic plot, full of gore, darkness and blood.
Highly recommended