One of my favorite tropes is mafia romance. This new book is not only mafia but dark, secret society, friends to lovers, and a marriage pact. Zara and Sean have been friends for years. Zara is his sister best friend. But, they have agreed not to date each other so that they can remain friends. Both are famous for getting bored of their partner and moving on. Sean sees Zara interacting with a strange man and he walks him outside and notices a strange branding/tattoo on his hand that looked familiar. As he thought about it he realized it was the same thing his father had on his hand. Now both Zara and Sean have been searching and requesting information about their fathers. Sean’s father either disappeared or died when he was very young and Zara’s father was missing the first 15 years of her life.  They are both enticed by people from the Underworld to come and get all the answers to their questions. But, the underworld is dark, forbidden and in many cases downright dangerous. Can their union help them find their answers? Is there a way out of this underworld and will they want to leave? I love when an author can come up with new and unique ideas. Excellent start to this new series.