Kevin Williamson scripted this thriller, an adaptation of Lois Duncan's novel about four teens involved in a hit-and-run incident. High school senior Julie is driving with friends when their car hits a fisherman. Assuming he's dead, they throw him in the water. Later they panic after an anonymous note arrives. It simply says, "I know what you did last summer." (In Duncan's book, the teens hit a small boy on a bicycle instead of a fisherman.)