Demi and Mattie were best friends form birth. The closest of twins they did everything together, even as they grew up. Four days before their 20th birthday they attend a party where Mattie crosses the line. Demi has to drive them both home in Mattie's car when a horrific accident occurs. Mattie dies as a result of the accident, but when the doctors assume Demi is Mattie, she takes her chance at a new life. Can she live happily as her sister or will the shadows of her past catch up to her?