Knock, Knock (Unrated Director's Cut)
After a killer has targeted several popular high school students, two detectives suspect the town recluse of the crimes.
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One never knows what one will find on the other side of the door. A group of popular high school students learn the lesson the hard way when they stumble into the path of a vicious killer. The gruesome result leaves the town in horror as two battling detectives work to crack the case. Suspicions arise as the school recluse is seen wandering late at night. The game of whodone-it gradually unfolds as the remaining survivors fear the worst...a knock that no lock can withstand.
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