The violence in the novel is largely off-screen or psychological. Barry is shot and paralyzed (a significant departure from the film where he is killed), forcing him to live with a permanent, physical reminder of his hubris. This shift in focus from "who will die next?" to "who is tormenting us?" allows Duncan to explore the characters' psyches with greater depth. The book is claustrophobic; the
Tragically, Duncan’s life mirrored her fiction. In 1989, her youngest daughter, Kaitlyn, was shot and killed in what authorities initially ruled a random shooting. Duncan believed her daughter was the victim of a contract killing and spent the rest of her life investigating the case. This personal history of unsolved violence and pursuit of justice adds a heartbreaking layer to the moral questions at the heart of I Know What You Did Last Summer . Duncan understood, perhaps better than any other YA author, that real-life horror does not come with a tidy resolution. i know what you did last summer by lois duncan