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The film opens in the picturesque, neon-drenched town of Silver Falls, which is rocked by a gruesome string of homicides. Exactly thirty-five years prior, a masked maniac known as the Sweet Sixteen Killer murdered four teenage girls on Halloween night, stabbing each victim sixteen times. The terror resurfaces when the elusive killer returns to claim a new generation of victims. Jamie Hughes, a fiercely independent and politically active teenager, brushes off her overprotective mother Pam’s obsessive security measures, unaware of the trauma haunting her family. When the killer breaches their home and brutally murders Pam, Jamie is plunged into unimaginable grief and panic.Determined to save her mother's life and rewrite history, Jamie’s brilliant science-geek friend Amelia constructs a makeshift time machine out of a photo booth. When the killer corners Jamie in the lab, she accidentally activates the device, jolting backward in time to October 1987—the exact week before the original murders began. Stranded in the retro past of teased hair, pastel windbreakers, and rampant high school bullying, Jamie realizes she must navigate teenage social hierarchies to track down the teenage versions of her parents and prevent the slayings before they happen.In 1987, Jamie befriends the teenage Pam, a viciously cruel and popular mean girl, along with her equally toxic clique. Disguised as a transfer student, Jamie tries to warn them about the impending bloodshed, but her urgent pleas are met with mockery and disbelief. Undeterred, Jamie launches an investigation to unmask the killer early. She suspects a sleazy local motel owner and an obnoxious school principal, but her amateur sleuthing leads to multiple dead ends and dangerous close calls. Meanwhile, she grows unexpectedly fond of the 1980s iterations of her peers, particularly her awkward future father, Blake, and her rebellious mother, who slowly shows glimpses of vulnerability beneath her toxic exterior.As Halloween night arrives, the killer strikes the high school dance. Chaos erupts as Jamie races against the clock to protect the teenage girls. In a shocking twist, the killer traps Jamie, revealing a personal grudge and deep-seated motivations tied to a forgotten tragedy from the town's past. A brutal, high-stakes showdown ensues in the school’s darkened maze, testing Jamie’s physical endurance and quick wit. Utilizing modern knowledge and fierce determination, Jamie manages to outsmart and overpower the assailant, unmasking them just as the temporal portal begins to close.Jamie leaps back through the booth, returning to a radically altered present day where her mother is alive, her relationships are forever changed, and the dark shadow of the Sweet Sixteen Killer has finally been erased from history.