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Mark, a divorced and depressed professor, met Stephen, a female student who was 23 years younger than him. Three months later, the girl unexpectedly became pregnant. Three years later, their married life was already a mess. One night, robbers broke into their home. Although the family was unharmed, Mark's cowardly performance that night and the psychological shadow left by the robbery on the whole family made the atmosphere at home very depressing. An old friend of Mark's suggested they take a vacation abroad. Unable to afford expensive accommodation, they found an apartment in central Paris through a house-swapping website. When they arrived in Paris, they found that the apartment building had been abandoned for many years. Apart from them, there was only a crazy female painter on the top floor. Weird things happen one after another, and when the perfect vacation turns into a nightmare, dark secrets between the couple begin to emerge.