De la Cruz has created a complex and fascinating mythology that combines history, vampire legend, and Biblical themes. Though the characters at first seem shallow and unlikable, as the series progresses, you might be surprised at who develops the most and becomes a hero. The twists and turns that occur, the path each character chooses, the relationships, are all surprising and exciting. These are page-turners, make no mistake. De la Cruz even manages to make sort-of incest not as creepy as it could be (you'll see what I mean when you read them; trust me, it's not as awful as it sounds).