In a remote corner of the Michigan woods, behind rusted iron gates and crumbling walls, lies a notorious sanitarium and its forgotten cemetery. The ruin is empty now, and the bulldozers have come to raze it. But as they do, a secret emerges. The coffin of Claudia DeFoe, the youthful love of Louis's foster father Phillip, is empty. When Louis tries to find the remains, he crosses paths with a reporter searching out rumors that a former patient, assumed dead, is alive and killing again. In Hidden Lake hospital, where the walls are stained with secrets and the air thick with the history of lingering screams, Louis is on his darkest journey yet -- into the mind of a deranged killer and into the locked rooms of his own psyche.