For six long years, Hamilton High School seniors Kelly Lynch, Jude Cunningham, Wendy Richards, and Nick McBride have been hiding the truth of what happened to 10-year-old Robin Hammond the day her broken body was discovered near an abandoned convent. The foursome keep secret how they backed Robin into a corner until, frightened, she stood on a window ledge and fell to her death. Though it was an accident, the then-12-year-olds feared they would be held responsible and vowed to never tell. But someone else was there that day, watching, and that someone is now ready to exact murderous revenge on prom night.

IMDb: https://www.imdb.com/title/tt0081383