When Don Koch, a man with a troubled past, moves into a rundown Victorian mansion with his pregnant wife Liz and their dog Cooper, he hopes to start anew. But the house has other plans. Strange occurrences begin to plague the family, and Don discovers that the house has a dark history of sordid affairs and murder. As he delves deeper into the mystery, he finds himself caught in a web of supernatural horror. Will Don and Liz be able to overcome the house's malevolent forces and lift the curse, or will they become its latest victims?

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Some movies that have similar genres and were produced around the same time as Girl on the Third Floor include Shattered, Talk to Me, Split, The Hunt, The Lie, Pearl.

Girl on the Third Floor was released for streaming on September 12, 2019.