I Know What You Did Last Summer is a 1997 American slasher film directed by Jim Gillespie, written by Kevin Williamson, and starring Jennifer Love Hewitt, Sarah Michelle Gellar, Ryan Phillippe, and Freddie Prinze Jr., with Anne Heche, Bridgette Wilson, and Johnny Galecki appearing in supporting roles. Loosely based on the 1973 novel of the same name by Lois Duncan, the film centers on four young friends who are stalked by a hook-wielding killer one year after covering up a car accident in which they were involved. The film also draws inspiration from the urban legend known as the Hook.
After having written Scream (released the year prior), Williamson was approached to adapt Duncan's source novel by producer Erik Feig. Where Williamson's screenplay for Scream contained prominent elements of satire and self-referentiality, his adaptation of I Know What You Did Last Summer reworked the novel's central plot to resemble a straightforward 1980s-era slasher film. Shot on location in both California and North Carolina in the spring of 1997, I Know What You Did Last Summer was released theatrically in North America on October 17, 1997. It received mixed reviews from critics but was commercially successful, grossing $72 million domestically, and remaining number 1 at the U.S. box office for three consecutive weeks. It would go on to gross an additional $53 million in other markets, making for a total of over $125 million worldwide box office returns. It was also nominated for and won multiple awards.