Who is behind Lissa's kidnapping, and why?

Lissa's uncle, Victor, suffers from Sandovsky's disease, which is a wasting disease that requires constant healing. Victor knows that Lissa can heal, because his daughter saw her heal the raven. Victor had Natalie leave the dead animals for Liss to try to catch her in the act of healing. Victor knows that Lissa's healing will eventually kill her, but he doesn't care. Victor feels that his life is more important than Lissa's. He also reveals that he had been using Ms. Karp to heal him before she turned Strigoi.