The Snorkel (1958) — AI Story Visualization

Plot Analysis Summary

A murderer uses a sealed-room method to conceal his crimes, but the same method ultimately traps him.

Story Structure — 5 Plot Phases

The Sealed Room Murder

Decker kills his wife through poisoning and gas while hiding beneath the floorboards with a snorkel. The sealed room encourages the Inspector and Wilson to consider suicide.

Key Events

• Drugged Murder — Decker drugs his wife and kills her by gassing the sealed room. Characters: Paul Decker Location: Italian villa
• Sealed Murder Room — Decker hides beneath the floorboards while breathing through a snorkel. Characters: Paul Decker Location: Villa bedroom
• Body Discovered — Household servants discover the body in a room sealed from inside. Characters: Paul Decker, Inspector Location: Italian villa
• Suicide Assumption — The officials treat the death as suicide despite the missing suicide note. Characters: Paul Decker, Wilson, Inspector Location: Villa bedroom

Suspicion Beneath the Floor

The young woman's accusations challenge Decker's false version of events. The dog repeatedly detects the hidden snorkel, leading Decker to poison it.

Key Events

• Suspicion Arrives — The arriving young woman immediately accuses Decker of killing her mother. Characters: Paul Decker, Jean Edwards Location: Italian villa
• Hidden Presence Sensed — A dog senses Decker beneath the floor, but the warning is ignored. Characters: Paul Decker Location: Villa bedroom
• Evidence Search — A search uncovers the snorkel, but its significance is not recognized. Characters: Paul Decker Location: Decker's room
• Dog Finds Snorkel — The dog finds the snorkel again, making Decker recognize it as a threat. Characters: Paul Decker Location: Decker's room
• Poisoned Dog — Decker poisons the dog after realizing it may expose his concealment method. Characters: Paul Decker Location: Italian villa
• Murder Accusation — Decker denies responsibility when the young woman accuses him of killing the dog. Characters: Paul Decker, Jean Edwards Location: Italian villa

The Beachside Attempt

A beach outing becomes another murder opportunity when Decker tries to drown the young woman. Jean's arrival in the water forces him to stop.

Key Events

• Beach Picnic — Decker takes Jean and the young woman to the beach under the appearance of normal social activity. Characters: Paul Decker, Jean Edwards Location: Beach
• Snorkel Revelation — Seeing a swimmer with a snorkel helps reveal how the sealed-room murder was carried out. Characters: Paul Decker Location: Beach
• False Rescue — Decker swims toward the young woman, pretending to rescue her while trying to drown her. Characters: Paul Decker, Jean Edwards Location: Sea near the beach
• Rescue Interrupted — Jean swims out, forcing Decker to abandon the attempted drowning. Characters: Paul Decker, Jean Edwards Location: Sea near the beach

The Second Sealed-Room Plot

Decker fabricates a suicide note and drugs the young woman with milk. Jean and Wilson arrive before he can complete the repeated concealment method.

Key Events

• Final Murder Plan — Decker decides that the young woman must be killed and prepares another sealed-room plan. Characters: Paul Decker Location: Italian villa
• Invented Suicide Note — Decker claims to have found a suicide note and summons the Inspector as part of his alibi. Characters: Paul Decker, Inspector Location: Italian villa
• Drugged Milk — Decker reads the fabricated note and persuades the young woman to drink drugged milk. Characters: Paul Decker Location: Villa bedroom
• Cabinet Blocks Escape — Jean and Wilson rescue the drugged victim, while the moved cabinet traps Decker beneath the rug. Characters: Paul Decker, Jean Edwards, Wilson Location: Villa bedroom

The Trapped Murderer

A cabinet blocks Decker's escape beneath the rug, turning his own method against him. The Inspector is finally sent to investigate the room.

Key Events

• Decker Calls For Help — Decker tries to emerge but remains trapped and calls for help from beneath the floor. Characters: Paul Decker Location: Villa bedroom
• Case Finally Exposed — The Inspector is sent to the room, allowing the sealed-room case to be solved. Characters: Paul Decker, Inspector, Wilson, Jean Edwards Location: Italian villa

Story Breakdown

• Murder Setup — Decker creates the central crime and conceals himself inside the sealed room.
  • Drugged Victim — Decker drugs his wife before gassing her in the villa.
  • Hidden Breathing Method — He hides beneath floorboards and breathes through a snorkel.
• False Suicide — The physical evidence leads the officials toward an apparently impossible suicide.
  • Sealed Evidence — Locked doors and sealed windows make the room appear inaccessible.
  • Official Misreading — The Inspector and Wilson initially accept the suicide explanation.
• Growing Suspicion — Accusations and repeated discoveries begin to threaten Decker's deception.
  • Direct Accusation — The arriving young woman identifies Decker as the likely killer.
  • Snorkel Discovery — The dog finds the object that explains the concealed murder method.
• Escalating Attacks — Decker responds to suspicion by removing evidence and attempting another murder.
  • Poisoned Dog — Decker poisons the dog after it repeatedly detects the snorkel.
  • Beachside Drowning — He disguises an attempted drowning as a rescue during the beach outing.
• Second Sealed Plot — Decker repeats his original strategy against the young woman.
  • Fabricated Note — He invents a suicide note and uses the Inspector's expected arrival.
  • Drugged Milk — He drugs the young woman before hiding beneath the floor again.
• Murderer Trapped — The concealment method turns against Decker and exposes the case.
  • Blocked Escape — A heavy cabinet is moved over the rug, preventing Decker from emerging.
  • Case Solved — The Inspector is sent to the room after Decker calls for help.

Directed by

Guy Green

Key Cast

• Peter van Eyck — Paul Decker
• Betta St. John — Jean Edwards
• Mandy Miller — Candy Brown
• William Franklyn — Wilson
• Marie Burke — Daily Woman