It's 1973, and deep within the secluded, treacherous mountains, amidst a relentless storm, the infamous Stephens Sanitarium for the Criminally Insane stands on the cusp of being shuttered forever. Lured into working a night shift, four rookie nursing students are charged with supervising the remaining inmates, deemed "harmless" by authorities. Yet, as night envelops the asylum, they find themselves trapped with a macabre array of deranged psychopaths, their histories stained with failed lobotomies, infamous serial killings, and unchecked madness.
In a desperate fight for survival, the nurses' sanity teeters on the edge, ensnared in a sinister psychological game of cat and mouse. At the heart of the terror is Nurse Charlotte, eternally tormented by the suicide of her twin sister in a similar establishment. Driven by guilt for leaving her sibling behind and a sincere commitment to aiding the mentally disturbed, she confronts a haunting question from her past: did her parents commit the wrong daughter?
