Mina is Derek's Sister. She was supposedly killed in the fire that took the rest of their family's life. Except Mina. The Hunters kidnapped Mina and put her in their training school. And when Mina's 17 she returns to Beacon Hills on a mission for the hunters, one she despises. She plans her own mission in return. I do not own Derek or the cast of Teen Wolf except for Mina and Allen, The Hunter's gaurd over Mina.All Rights Reserved