"I'll Always Know What You Did Last Summer" is a 2006 horror film and the third installment in the I Know What You Did Last Summer series. The story follows a group of friends who are haunted by a mysterious killer after a deadly accident during a summer party. As they try to uncover the truth, they realize that their past actions have come back to haunt them. The film features a new cast, including Brooke Nevin and David Paetkau, and introduces a supernatural element to the slasher genre. It explores themes of guilt, friendship, and the consequences of one's actions, all while delivering suspenseful moments and thrilling scenes.