Death of a Thousand Cuts — Barbara D'Amato

The Hawthorne House was once known for its remarkable success rate with autistic children. Now, fifteen years after it closed former residents have returned to Hawthorne House for their first-ever reunion. But the gala event turns into a bloody nightmare when the House's revered founder, Dr. Jay Schermerhorn, is found tortured to death in the mansion's basement.
Schermerhorn had enjoyed a worldwide reputation for his innovative methods and compassionate treatment of autistic children. How could anyone have hated him enough to kill him? As Chicago detectives probe deeply into the history of Hawthorne House, a troubling picture emerges--of a man who inspired both fear and hatred in the children and families who came to him for help.