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Genre specialist Ulli Lommell draws inspiration from the master of cosmic horror for this frightener concerning a group of people held prisoner by a sadistic warden known only as The Puppetmaster. Drawn in by curiosity, the unfortunate souls who fall into the Puppetmaster's diabolical trap of perpetual darkness. The fate of each held in the merciless grip of a maniacal madman, the Puppetmaster's victims awaken with agonizing wounds of varying severity before being tormented by an unseen villain who insists that only one of the group will make it through the ordeal alive.