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Jessica Burns enlists the help of her best friend, Brian, in order to document the relentless harassment she's received from her former friend, Avery Keller, one of South Brookdale High School's most popular students.。In a near future, crimes and accidents can be prevented by making just one phone call to the past. However, the peace of this utopian world will be disrupted by a methodical killer who seems to have discovered the only flaw in this system.。