The Adoption Lie

My book idea is called The Adoption Lie. It is about a girl named Carly who is adopted at 3 years old by the Williamsons, a very rich family. She is told that her parents died because of a pack of wolves. Though she's pretty sure that that's not the case when she secretly looks in her step parents top secret file about her and her family which gives her clues on what her family looks like and where they probably were. She eventually runs away from home to find her parents.