Eighteen-year-old Sophie Mannar killed her best friend. At least she thinks she did. After a devastating car accident, Sophie has to live with the guilt of surviving while her best friend, Christine Stone, has died. With only three months left of senior year, managing grief alone while trying to keep Christine's memory alive, becomes a daily struggle. In a series of letters, Sophie attempts to find peace as she records the daily events of her life, hoping to find answers about both her and Christine's lives. High school is hard enough, but how is Sophie going to handle the pressures without her best friend?