A married couple in their 50's retreat to a secluded vacation cabin, hoping to mend their strained relationship. From the moment they arrive, they are given one rule: the door at the end of the hall is strictly off-limits. At first, the husband is mildly curious, but as the days pass, the door seems to call to him. Strange occurrences-whispers in the night, fleeting shadows, objects not where they were left-slowly unravel his sanity. His curiosity festers into obsession, consuming his every thought. What lies beyond the door? The answer may be far more terrifying than he ever imagined.