Based on Lois Duncan's novel, this is the story of four teens (Jennifer Love Hewitt, Sarah Michelle Gellar, Ryan Phillippe, and Freddie Prinze Jr.) who are responsible for the fourth of July hit-and-run killing of a little boy. The kids escape undetected, but the next summer, one of them receives a note that reads, "I know what you did last summer," and the scene is now set for more killings. 1 User Review