Plot Analysis Summary
A lighthouse takeover becomes a sabotage mystery in which deceptive identities, a hidden mastermind, and a failing beacon threaten the Mary Fern.
Story Structure — 5 Plot Phases
Arrival At The Haunted Lighthouse
Sam arrives in Tan-Y-Bwlch and accepts responsibility for the North Stack lighthouse. David explains the disappearances and the shipwreck associated with the phantom light.
Key Events
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Sam Arrives At Tan-Y-Bwlch — Sam arrives by train to take over the North Stack lighthouse. Characters: Sam Higgins
Location: Tan-Y-Bwlch train station
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Alice Requests Lighthouse Access — Alice asks Sam to take her to the lighthouse for a psychic investigation. Characters: Alice Bright, Sam Higgins
Location: Tan-Y-Bwlch
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The Keepers Disappeared — David tells Sam that Jack Davis and the previous chief keeper disappeared. Characters: Sam Higgins, David Owen
Location: Harbour Master's office
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The Phantom Shipwreck — David connects a major shipwreck to the alleged phantom light. Characters: Sam Higgins, David Owen
Location: Harbour Master's office
Strangers Reach North Stack
Sam travels to the lighthouse with the local staff and encounters the unstable Tom. Jim and Alice then reach the isolated station under increasingly suspicious circumstances.
Key Events
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Jim Seeks Lighthouse Passage — Jim tries to bribe Sam for transport and is suspected of being a reporter. Characters: Jim Pearce, Sam Higgins
Location: Tan-Y-Bwlch
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The Staff Reaches The Lighthouse — David, Dr. Carey, and others bring Sam by boat to the lighthouse. Characters: Sam Higgins, David Owen, Dr. Carey, Claff Owen, Tom Evans
Location: North Stack lighthouse
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Tom Attacks Dr. Carey — Tom tries to strangle Dr. Carey during the examination. Characters: Tom Evans, Dr. Carey, Sam Higgins
Location: North Stack lighthouse
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Sam Restrains Tom — Sam ties Tom up because the disturbed keeper cannot safely be moved. Characters: Sam Higgins, Tom Evans
Location: North Stack lighthouse
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Jim Arrives With Alice — Jim arrives in a boat out of petrol and discovers Alice as a stowaway. Characters: Jim Pearce, Alice Bright, Sam Higgins
Location: Near North Stack lighthouse
Lies And Hidden Signals
A fire and secret plotting intensify suspicion among the lighthouse occupants. Jim and Alice offer conflicting accounts of their identities while preparing radio equipment.
Key Events
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Alice Changes Her Story — Alice claims she is an actress hiding from police after a knife fight. Characters: Alice Bright, Sam Higgins, Jim Pearce
Location: North Stack lighthouse
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Fire Starts Near Tom — A fire breaks out near Tom's bed, increasing suspicion inside the lighthouse. Characters: Tom Evans, Claff Owen, Sam Higgins
Location: North Stack lighthouse
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Jim Admits Deception — Sam overhears Jim plotting with Alice and learns that Jim is not a reporter. Characters: Jim Pearce, Alice Bright, Sam Higgins
Location: North Stack lighthouse
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The Radio Aerial Is Hung — Alice hangs Jim's radio aerial outside while Tom secretly observes her. Characters: Alice Bright, Jim Pearce, Tom Evans
Location: Lighthouse bunk room
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Jim Claims Naval Authority — Jim claims to be a naval officer investigating wreckers targeting the Mary Fern. Characters: Jim Pearce, Sam Higgins
Location: North Stack lighthouse
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Alice Claims Detective Status — Alice tells Sam that she is a Scotland Yard detective. Characters: Alice Bright, Sam Higgins, Jim Pearce
Location: North Stack lighthouse
The Sabotaged Beacon
The lighthouse staff are attacked, the main light is sabotaged, and a decoy signal threatens the approaching Mary Fern. Jim attempts to warn the ship before Tom stops him.
Key Events
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The Lighthouse Signal Is Sabotaged — Bob and Claff are knocked unconscious, the main light is sabotaged, and a decoy light appears. Characters: Bob Peters, Claff Owen, Dr. Carey, Sam Higgins
Location: North Stack lighthouse
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Jim Warns The Mary Fern — Jim transmits a warning to the approaching Mary Fern. Characters: Jim Pearce, Alice Bright
Location: Lighthouse radio room
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Tom Disables The Radio — Tom knocks Jim out, disables the radio, and locks the group inside. Characters: Tom Evans, Jim Pearce, Alice Bright, Sam Higgins
Location: North Stack lighthouse
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Jim Swims For Help — Jim climbs down the lighthouse and swims to the village to alert the coast guard. Characters: Jim Pearce
Location: Sea below North Stack lighthouse
Revelation And Rescue
Claff frees the trapped occupants, and Dr. Carey is exposed as the mastermind. Sam repairs the light, the Mary Fern is saved, and Carey is trapped at the tower's summit.
Key Events
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Claff Unlocks The Lighthouse — Claff regains consciousness and unlocks the door, freeing Sam and Alice. Characters: Claff Owen, Sam Higgins, Alice Bright, Tom Evans
Location: North Stack lighthouse
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Dr. Carey Is Exposed — Sam and Alice overhear Dr. Carey speaking with Tom and identify him as the mastermind. Characters: Dr. Carey, Tom Evans, Sam Higgins, Alice Bright
Location: North Stack lighthouse
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Sam Repairs The Light — Sam repairs the lighthouse light while the Mary Fern approaches danger. Characters: Sam Higgins, Alice Bright, Claff Owen, Dr. Carey
Location: North Stack lighthouse
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The Mary Fern Is Saved — The restored signal and warning save the Mary Fern just in time. Characters: Sam Higgins, Alice Bright, Jim Pearce, Dr. Carey
Location: North Stack lighthouse and surrounding sea
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Dr. Carey Jumps — Trapped at the top of the lighthouse, Dr. Carey decides to jump. Characters: Dr. Carey, Sam Higgins, Alice Bright
Location: Top of North Stack lighthouse