They thought it was over... Last summer, four friends made a desperate pact to conceal a shocking secret. But now, someone has apparently learned the truth of their heinous act and the horror is starting again. There is an unknown avenger out there stalking them in a deadly game. Will he stop at terror--or is he out for revenge? Jennifer Love Hewitt, currently starring on Fox Television's hit series "Party of Five," and Sarah Michelle Gellar, the star of the new hit Warner Bros. television series "Buffy, the Vampire Slayer," star in I Know What You Did Last Summer, a horror thriller from screenwriter Kevin Williamson, whose last project was the critical and popular hit Scream.