Get the Book - Death Ward 13

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?