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"Knock Knock" is a psychological thriller directed by Guillermo del Toro and written by Dan Gilroy. The movie follows the story of Eric Maser (Keanu Reeves), a recently divorced father who is home alone with his two daughters. When a stranger (Lorenza Izzo) shows up at his doorstep, Eric's life takes a dark and unexpected turn. As the story unfolds, Eric finds himself in a desperate fight for survival.
