In the tradition of 'Halloween' and 'Friday the 13th' comes a terrifying journey of revenge and bloodlust, as a group of high school students pay the ultimate price for their parent's transgressions. Someone is killing the students at a high school, leaving the obscure message "Knock Knock" written in blood next to the victims. It all links back to a high school prank gone very wrong and a retired detective and his detective protege try to find a connection between the murders and the victims, but finding this killer will prove to be more challenging than they ever imagined. Whatever you do...Do Not Answer the Door.
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