Story Structure — 5 Plot Phases
The Original Sin
A child murders his mother after being punished over a jigsaw puzzle. He hides the crime behind a false witness story, creating the foundation for the later killings.
Key Events
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Puzzle Game Punished — As a child, the future dean is scolded for playing with a nude-woman puzzle. Characters: The Dean
Location: Family home
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Mother Murdered — The child returns with an axe and murders his mother after she orders him to discard the puzzle. Characters: The Dean
Location: Family home
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Body Dismembered — He dismembers his mother's body with a hacksaw. Characters: The Dean
Location: Family home
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False Witness Story — He hides in a closet and pretends to be a witness when the police arrive. Characters: The Dean
Location: Family home
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Forty Years Later — Four decades later, a black-clad figure watches a skateboarder crash into a mirror. Characters: The Dean
Location: University grounds
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Puzzle Reassembled — The figure opens a box containing family evidence and begins rebuilding the bloodied puzzle. Characters: The Dean
Location: Unknown room
Campus Bloodshed
Decades later, a chainsaw killer begins dismembering students at a Boston university. The groundskeeper becomes a suspect while the killer manipulates victims with forged notes.
Key Events
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Puzzle Reassembled — The figure opens a box containing family evidence and begins rebuilding the bloodied puzzle. Characters: The Dean
Location: Unknown room
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Campus Chainsaw Murder — A female student is decapitated on the university lawn, and her head is stolen.
Location: University lawn
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Campus Investigation — The dean gives detectives a campus tour while Willard trims hedges with a chainsaw. Characters: The Dean, Willard
Location: University campus
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Pool Note Deception — The killer sends a student a fake sexual invitation to divert him from the intended victim. Characters: The Dean
Location: University pool
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Poolside Killing — The intended victim is murdered, and Willard is arrested after a chainsaw is found beside the remains. Characters: The Dean, Willard
Location: University pool
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Anatomy Examination — The anatomy professor inspects the remains, and the dean is briefly considered a suspect. Characters: The Dean
Location: University anatomy area
The Hidden Pattern
Further murders occur in the elevator and locker room as the investigation expands. Mary enters undercover, and the investigators infer that the murderer belongs to the faculty.
Key Events
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Anatomy Examination — The anatomy professor inspects the remains, and the dean is briefly considered a suspect. Characters: The Dean
Location: University anatomy area
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Undercover Infiltration — Mary Riggs joins the investigation undercover, posing as a tennis instructor at the college. Characters: Mary Riggs
Location: University tennis courts
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Elevator Dismemberment — The killer saws off a student's arms inside an elevator before escaping. Characters: The Dean
Location: University elevator
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Reporter Silenced — The killer stabs a reporter to death on a waterbed. Characters: The Dean
Location: Waterbed room
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Locker Room Attack — The killer chases a tennis student, while Mary focuses on shutting off blasting music used as a diversion. Characters: Mary Riggs, The Dean
Location: University locker room
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Victim Legs Removed — The victim is sawed in half, and the killer escapes with her legs. Characters: Mary Riggs, The Dean
Location: University locker room
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Faculty Killer Theory — The investigation concludes that the killer is likely faculty because he knows campus timing and avoids police. Characters: Mary Riggs, The Dean
Location: University campus
A Name Reclaimed
The investigation links the dean to a changed identity and a violently murdered mother. The hidden past transforms the dean from institutional authority into the central suspect.
Key Events
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Faculty Killer Theory — The investigation concludes that the killer is likely faculty because he knows campus timing and avoids police. Characters: Mary Riggs, The Dean
Location: University campus
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Dean Identity Revealed — Investigators discover that the dean changed his name and that his mother was brutally murdered. Characters: The Dean
Location: University records
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Mary Drugged — The Dean drugs Mary with a paralytic substance and attempts to saw off her feet. Characters: Mary Riggs, The Dean
Location: The Dean's apartment
The Human Puzzle
The Dean attacks Mary in his apartment but is shot during the rescue. The discovery of his stitched human puzzle leads to one final supernatural assault.
Key Events
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Mary Drugged — The Dean drugs Mary with a paralytic substance and attempts to saw off her feet. Characters: Mary Riggs, The Dean
Location: The Dean's apartment
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Apartment Rescue — Police enter the apartment, The Dean is shot dead, and Mary is rescued. Characters: Mary Riggs, The Dean
Location: The Dean's apartment
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Human Puzzle Discovered — A rotating bookshelf reveals a decomposing human puzzle assembled from victims and dressed in the mother's dress. Characters: Mary Riggs, The Dean
Location: The Dean's apartment
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Corpse Final Attack — The stitched corpse inexplicably comes alive and attacks as Mary turns to leave. Characters: Mary Riggs, The Dean
Location: The Dean's apartment
A frustrated Boston detective searches for the maniac responsible for mutilating a number of university coeds.