Monster

A corpse is found in a car trunk. The victim was a twenty-five-year-old would-be actor called Richard Dada. He had been sawn in half. Eight months later, the body of Claire Argent, a psychologist at a hospital for the criminally insane, is discovered. She was mutilated in the same, horrific way.
Detective Milo Sturgis is put on the case and, when the incoherent ramblings of a patient locked up in a mental hospital for the criminally insane begin to make terrifying sense, he calls on psychologist Alex Delaware to help him delve into the muddy waters of insanity.