The Mistborn's Guide to Allomancy

The other main character is a young woman, a teenage woman Vin. She's running with this thieving crew in the main city of the story. Her brother like beat her up all the time was really bad to her. And so she doesn't trust anyone. So what she was doing without even knowing it was she was burning zinc. If you are a mistborn, you can use all eight metals and missborn are pretty rare.