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Val and her friends play a game that allows them to communicate with the dead. The Knock Knock Game turns any doorway into a portal to the hereafter, but the girls soon learn that are rules that should never be broken.
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Other movies with this title: Knock Knock (US, 1940), Knock Knock (US, 2008), Knock Knock (CL/DE/IL/US, 2015), Knock Knock (2017), Knock Knock (US, 2018), Knock Knock (CN, 2021)