Mom, is that you?

Elizabeth Grace, an average 17 year old girl, goes on vacation to Italy. Upon her arrival back to LA, she couldn't find her mother in the airport. Eventually, she finds her mother and returns home safely. Exactly one year later, she was sent camera footage of her mother being murdered by a woman. Scared out of her wits, she finds out that her "mother" was the murderer. Her plan to escape forces her to make a life threatening decision. What will she do?