As they celebrate their high school graduation, four friends are involved in a hit-and-run accident when their car hits and apparently kills a pedestrian on an isolated roadway. They dispose of the body and vow to keep the incident a secret, a year later somebody starts sending them letters bearing the warning "I Know What You Did Last Summer."
Alternative titles: Ich Weiss Was Du Letzten Sommer Getan Hast
Links: IMDb, Posters
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