Story Structure — 4 Plot Phases
Bodies in the Swamp
An investigator and an excavator operator are found dead near a rural swamp. Evidence suggests that the apparent suicide was actually another murder, opening a larger investigation.
Key Events
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Decapitation at the Swamp — An insurance investigator is decapitated by an excavator in an apparently isolated murder.
Location: Rural swamp area
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The Driver Is Found Hanged — The excavator operator is found hanging, making the first death appear connected to suicide.
Location: Rural area
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Suicide Evidence Is Challenged — A clue shows that the excavator operator was murdered rather than having committed suicide.
Location: Rural crime scene
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The Cold Case Emerges — The murdered investigator is linked to an old kidnapping and murder involving a wealthy family.
Location: Investigation records
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A Failed Ransom — A father attempting to pay ransom is also kidnapped, and both victims are left to die.
Location: Kidnapping case background
The Buried Kidnapping
The investigation uncovers an old kidnapping involving a wealthy family and a failed ransom. The murdered investigator had apparently found information valuable to the victims' relatives.
Key Events
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The Investigator Wanted Payment — The investigator appears to have found a lead and planned to sell it to the victims' relatives.
Location: Investigation context
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Family Interrogations Begin — The commissioner questions relatives, servants, and people connected with the old kidnapping case.
Location: Family residence
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A Public Station Strangling — The murdered investigator's wife is strangled at a public transport station.
Location: Public transport station
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The Teacher Is Mutilated — The victim's former kindergarten teacher is mutilated with a circular saw.
Location: Unknown location
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Mattia Is Bludgeoned — A destitute man living near the original crime scene is beaten to death with a statue.
Location: Shack near the swamp
Murder Spreads Through the Case
Further killings target people connected with the old case, including the investigator's wife, a teacher, and a man living near the swamp. The violence suggests an active attempt to erase witnesses and evidence.
Key Events
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The Shack Holds the Answer — The commissioner reaches the shack where the kidnapping victims were left to die.
Location: Abandoned shack
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A Hidden Drawing Is Noticed — The commissioner realizes that a clue was left on the back of a mirror before the young victim died.
Location: Abandoned shack
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The Mirror Changes Hands — An elderly woman unknowingly comes into possession of the mirror containing the hidden clue.
Location: An elderly woman's home
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Attack on the Elderly Woman — The murderer attempts to kill the elderly woman to recover the mirror.
Location: An elderly woman's home
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The Murderer Escapes — The commissioner arrives in time, but the murderer flees before being captured.
Location: An elderly woman's home
The Mirror Reveals All
A mirror recovered from the kidnapping site contains a clue left before the young victim's death. The commissioner uses it to expose the murderer during a gathering at the family residence.
Key Events
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The Mirror Is Examined — The commissioner examines the back of the recovered mirror and recognizes its decisive implication.
Location: Investigation room
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The Family Is Summoned — The commissioner summons the police and gathers the family inside the residence.
Location: Family residence
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The Killer Is Denounced — The commissioner condemns the killer for repeated murders while emphasizing the overlooked identifying clue.
Location: Family residence
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Beniamino Screams — When the mirror's back is shown, Beniamino screams before the room is plunged into darkness. Characters: Beniamino
Location: Family residence
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The Confession and Arrest — After the lights return, the killer confesses, and the commissioner orders the police to make the arrest.
Location: Family residence
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The Missing Hand Clue — The mirror reveals a drawing of a human figure missing one hand, identifying the killer's distinctive physical feature.
Location: Family residence