In 1986, police discover a grisly crime scene: a family shot in their beds at point-blank range. The mystery deepens when a sole survivor appears.
A calm, bespectacled suspect reenacts the massacre and says an odd entity made him do it. But his lawyer has a theory about a real motive.
Observed at a psychiatric hospital and composed in court, the accused remains a locked box and offers few clues. Now the therapist revisits his case.