Escorted from prison under heavy guard, murderous psychopath Frank Snow is scheduled for an emergency brain scan at Tanglewood Memorial Hospital, an institution that is closing its doors after one final night of operation. But Snow has something far more terrifying planned. And once the lights go out, a fiendish game of hide-and-seek begins.

Alone in the dark with a homicidal madman who knows their fears, their secrets, and their every move, MRI technician Mike Hughes, his wife and child, and the other unlucky souls trapped in the hospital have no choice but to duel with the devil incarnate. If they play by their stalker's twisted rules, some of them might just survive. But there's more to Frank Snow than the naked eye can see . . . or the sane mind can bear.