Oh the spin-off series is very good. Bloodlines was so great that I couldn't put it down! It's about Sydney, Adrian, and Jill, Lisa's long-lost sister. I'm giving a ton of spoilers and I'm sorry about that but they end up hiding out and they can't let anyone know that they're there, of course because everyone wants to kill Jill so Lisa won't take the throne any longer. But while they're at the new school for Jill and Sydney, they learn about these tattoos and figure out that they have.. I think it was either Mouri, Dhamphir, or Stragoi blood. I can't remember at the moment.