"I Know What You Did Last Summer" is a gripping children's book by Lois Duncan that immerses readers in a world of secrets and suspense. The story revolves around four friends who make a pact to keep a dark secret after a terrible incident. However, when an unknown pursuer appears, hunting them in a deadly game, it becomes clear that their past won't let them go. This book, regarded as a cult classic, offers a compelling narrative about friendship, fear, and the consequences of choices. The thrilling plot and unpredictable twists make it an essential reading experience for young readers interested in exciting stories.