Nightwatcher — Charles Wilson

The staff of the hospital for the criminally insane in Davis County, Mississippi, had seen a lot in their time--but nothing like the savage killing of Judith Salter, one of their nurses. And with three escaped inmates on the loose, there is no telling which of them the butcher is or who the next victim will be. Even worse, as the danger and terror grow apace, the only eyewitness to the nurse's death is a psychopathic mass murderer who is beginning to reveal his own fearsome agenda.