In Westland, New York during the 21st century, a murderer is ruthlessly taking lives with a sharp knife. One innocent girl stumbles upon the gruesome scene and becomes a victim herself. Returning to her hometown with Jo, Meg plans to celebrate Shirley's "birthday." Despite being orphans, they had established the day they met as Shirley's special day. Meg had once cared for Shirley and two other children before meeting Jo. The children were later adopted by a police officer known for his strong sense of justice, and they were presumed to be living happily. After Meg and Jo lend a helping hand to someone and receive a reward, they decide to use the money to buy a gift for Shirley. However, upon meeting Sam, they soon discover that Shirley had been attacked by the same murderer they had been hearing about. Jo suggests seeking revenge, but the murderer has other plans and closes in on them. As if that were not enough, a dark and sinister plot threatens to envelop the entire town and everyone in it, including Meg, Jo, and Sam.