Rina Kent's "Empire of Sin" is a dark romance and mafia novel, part of the Empire series. Anastasia, a "mafia princess," is trying to escape the dark world she was raised in, where every action is controlled by Bratva. She meets Knox Van Doren, a man with a charming smile but who is actually a true villain. The book contains scenes of violence, sexual content, and strong language; reader discretion is advised.