I need help thinking of a name for my book...?

It is about an eighteen year old girl , finds out more about her past then she had hoped. She is a doppelganger , and is being hunted by a man born in the eighteen hundreds. He needs her life to bring back the women he loved , who is her exact look-a-like. She may be resurrected , not sure yet I'm about half way through writting it. Help please!! Thanks :)