After four high school friends are involved in a hit-and-run road accident, they dispose of the body and vow to keep the incident a secret. A year later, they each start receiving anonymous letters bearing the warning "I Know What You Did Last Summer."
Karen McCoy is released from prison with nothing but the clothes on her back. Before being incarcerated Karen was the bank robber of her time, but now she wishes for nothing more than to settle down and start a new life. Unfortunately between a dirty parole officer, old business partners, and an idiot ex-husband she will have to do the unthinkable in order to save her son.