During a punk rock New Year's Eve celebration, popular TV host Diane Sullivan receives a series of unsettling phone calls from an unknown, masked man who calls himself "Evil". He taunts her by announcing that he will murder someone close to her every time the clock strikes midnight in each of four U.S. time zones. Despite attempts to involve the police, the killer's deadly intentions seem unstoppable as he uses his cunning and disguises to evade capture and continue his spree.

The tension escalates as Diane battles rising fear for her own safety and the lives of those around her. As midnight approaches in each time zone, the maniac's promises are horrifyingly kept, pushing the boundaries of Diane's nerve. This relentless game of cat and mouse traps her in nightmarish suspense within the confines of the chaotic New Year's festivities. Meanwhile, the authorities struggle to piece together clues that could reveal the identity of "Evil" and prevent further bloodshed before it’s too late.