In a grim, foreboding atmosphere, a high-security mental institution plays host to a chilling scenario. The story begins when the notorious serial killer, David Emerson, deemed insane, is accused of horrific murders. Despite being declared mad, Emerson consistently claims innocence, maintaining that a mysterious "Blue Hand" is the true culprit. His twin brother Richard, who closely resembles him, is concerned and skeptical of the accusations laid against David. Meanwhile, an inexplicable escape from the institution sets off a series of macabre events, triggering the authorities to launch an investigation. Suspicion looms over the entire Emerson family, especially as secrets and tensions simmer beneath their respectable facade.

As bodies start piling up around an old ancestral estate owned by the Emerson family, it's clear that no one can be trusted. The investigation circles back to David and this enigmatic Blue Hand figure. Both themes of identity and madness envelop the narrative, with long-held family mysteries coming to light. The eerie atmosphere grows tense as the detectives must unravel the twisted threads connecting the Emerson family history with the grim sequence of killings. Motives blend with madness, and deception hides within the shadowy corridors of power and relationships, leaving everyone questioning who might possess motives to kill. Amid suspense and suspicion, the fluid dynamic between familial loyalty and distrust comes to a harrowing head halfway through, leaving audiences on edge.