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The brutal murder of a Catskill Mountains family sets into motion a terrifying sequence of events as the horrors of H.P. Lovecraft come to the screen courtesy of directors Barrett J. Leigh and Thom Maurer. The year is 1908, and a mountain man named Joe Slaader has just committed the ultimate atrocity. Committed to the Ulster County Asylum after murdering his entire family, the man with the mysterious growth on his back is seen by the studied doctors of the facility as the harbinger of the dark days to come. When the inmates of the asylum decide to turn on their captors and wrestle away control of the remote asylum, the strange events that follow precede the ominous arrival of a dark force that the mind of man may not hold the power to comprehend.