You do not have to have read any of the author's other books in order to read or understand this one, but I believe that my experience with loving the others made me more excited for this one. The parents of the leads in this story had a heck of a storyline in their books so I will always be interested in anything to do with them.
Violet seems to be a bit sheltered and a tad emotional. Maybe her parents were trying to give her more of a perfect life than they had. She knows there is something off in her family's past but isn't sure what it is. Vincete grew up the differently. He was shielded from nothing and has participated in the underbelly of society alongside his father. When they connect, it leads to some wild sex and deep introspection.
Black Hearts is sort of a Romeo & Juliet type situation. The McQueen's and Bernal's are enemies. There's a lot of bad blood in the past. The possibilities are endless when it comes to how this will turn out. Everyone has their own plans, and no one really knows the mindset anyone else is in or what they're truly capable of doing. I'm definitely looking forward to the conclusion in Dirty Souls.