Vampires rule the earth. Humans are the slaves.  There can be no love between these two kinds. It goes against the vampire law.  If either kind breaks this law they are sentence to death. Amber is a mere human, who is in love with Krystal. But she is a vampire and not any vampire, she royalty a princess. Who thinks of humans as food. Each royalty must pick a slave for themselves, as a personal servant. They can use them for food, do there chorus, or even pleasure. This only happens when the