Story Structure — 5 Plot Phases
Admission Behind Closed Doors
The rural villa is introduced as an asylum, and Ruth enters treatment after suicidal behavior and an assault on an orderly. Medical discussions establish the clinic's uncertain promise of recovery.
Key Events
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Rural Villa Asylum — A large rural villa operates as an asylum under Dr. Francis Clay's direction. Characters: Dr. Francis Clay
Location: Rural villa clinic
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Ruth Enters Treatment — Ruth is committed to the clinic by her husband for psychiatric treatment. Characters: Ruth
Location: Clinic admission area
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Ruth Attempts Escape — Ruth assaults an orderly and attempts suicide before being restrained. Characters: Ruth
Location: Clinic room
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Treatment Is Debated — Clay discusses a patient's recovery prospects and the danger of recurring suicidal urges. Characters: Dr. Francis Clay
Location: Clinic office
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Helen Tends Mara — Helen tends to Mara, who says that treatment seems to be improving her condition. Characters: Nurse Helen
Location: Mara's room
Murder Among the Patients
The clinic's ordinary social routine gives way to a series of violent attacks by a hooded killer. Ruth and other people inside the institution are murdered in increasingly graphic circumstances.
Key Events
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Helen Tends Mara — Helen tends to Mara, who says that treatment seems to be improving her condition. Characters: Nurse Helen
Location: Mara's room
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A Patient Disappears — A patient follows the gardener toward the greenhouse but is later called back by medical staff.
Location: Clinic grounds
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Evening Social Gathering — Attendants and patients mingle, play cards, and participate in board games. Characters: Nurse Helen, Nurse
Location: Clinic common room
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Nurse Is Beheaded — A hooded killer waits outside and beheads a nurse with a scythe. Characters: Nurse Helen
Location: Clinic grounds
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Greenhouse Seduction — A patient seduces the gardener in the greenhouse, then leaves after a violent dispute.
Location: Greenhouse
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Ruth Is Murdered — The killer enters Ruth's room, chokes her, and stabs her in the chest. Characters: Ruth
Location: Ruth's room
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Night Search Begins — Medical staff investigate noises in the hallway while the killer continues moving through the clinic. Characters: Dr. Francis Clay, Nurse Helen
Location: Clinic hallway
Blood on the Weapons
Further killings spread through the rooms and corridors while staff struggle to understand the threat. Blood on the antique weapons and a missing sword provide the first major physical clue.
Key Events
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Night Search Begins — Medical staff investigate noises in the hallway while the killer continues moving through the clinic. Characters: Dr. Francis Clay, Nurse Helen
Location: Clinic hallway
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Chauffeur Is Killed — The killer pushes a visiting chauffeur into an iron-maiden-like device and kills him.
Location: Clinic interior
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A Dangerous Departure — Clay leaves a patient's company to conduct his rounds after discussing a possible relationship. Characters: Dr. Francis Clay
Location: Clinic hallway
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Bedroom Axe Attack — The hooded killer enters a sleeping patient's room and kills her with an axe.
Location: Patient bedroom
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Window Crossbow Murder — During a private encounter, a crossbow bolt strikes the patient through the window and Helen screams. Characters: Nurse Helen
Location: Mara's room
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Weapons Reveal the Pattern — Blood on the antique weapons and a missing sword connect the display to the murders. Characters: Dr. Francis Clay
Location: Clinic weapons display
The Police Close In
The police secure the asylum and remove the bodies, while medical staff face criticism for mishandling evidence. The inspector proposes using a patient as bait despite Clay's concern.
Key Events
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Police Secure the Clinic — The inspector arrives after the clinic reports that the killer remains inside. Characters: Dr. Francis Clay, Inspector
Location: Rural villa asylum
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A Patient Becomes Bait — The inspector proposes using a vulnerable patient as bait, while Clay urges reconsideration. Characters: Dr. Francis Clay, Inspector
Location: Clinic office
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The Killer Is Unmasked — The killer approaches the bait with a rope, is interrupted by detectives, and is revealed as her husband. Characters: Dr. Francis Clay, Inspector
Location: Patient room and corridors
The Mask Falls
The killer approaches the bait and is interrupted before completing the strangulation. The concealed identity is exposed, followed by a final pursuit and a deadly attack on the women sheltering inside.
Key Events
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The Killer Is Unmasked — The killer approaches the bait with a rope, is interrupted by detectives, and is revealed as her husband. Characters: Dr. Francis Clay, Inspector
Location: Patient room and corridors
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Final Pursuit — The revealed killer knocks out two pursuing officers and hides inside the clinic. Characters: Inspector
Location: Clinic corridors
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The Last Killing Spree — The killer attacks the women sheltering in a room before police enter and shoot him dead. Characters: Inspector
Location: Clinic room
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The Asylum Falls Silent — The killer is dead, ending the concealed murder campaign inside the clinic. Characters: Dr. Francis Clay, Inspector
Location: Rural villa asylum
A masked killer stalks an institution for mentally disturbed rich women.