Plot Analysis Summary
A recovered wartime secret draws a reluctant operative into a multinational pursuit involving betrayal, espionage, and a dangerous underwater mission.
Story Structure — 5 Plot Phases
The Wrecked Secret
Henry Baker discovers a German U-boat and removes a briefcase containing an ominous diary. Translation reveals a postwar network of Nazi sympathizers and a second case still aboard the submarine.
Key Events
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U-Boat Wreck Discovery — Henry Baker discovers a wrecked German U-boat and retrieves a briefcase. Characters: Henry Baker
Location: Caribbean seabed
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The Hidden Documents — Baker finds German documents and notices references to Martin Bormann and postwar dates. Characters: Henry Baker
Location: Henry Baker's home
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Translation in England — Baker brings the documents to a German-speaking contact for translation. Characters: Henry Baker
Location: England
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Sympathizer Network Revealed — The documents reveal Nazi sympathizers in the United Kingdom and America. Characters: Charles Ferguson, Prime Minister, Sir Francis
Location: Prime Minister's office
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Second Case Disclosed — The diary indicates that a second case remains inside the submarine. Characters: Charles Ferguson, Prime Minister, Sir Francis
Location: Prime Minister's office
Silence in London
Government officials attempt to question Baker, but his sudden death removes their most direct source. A residence is searched and bugged while the investigation becomes increasingly secretive.
Key Events
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Baker Dies Unexpectedly — Baker dies after looking the wrong way and being struck by a London bus. Characters: Henry Baker, Charles Ferguson
Location: London street
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Fascist Family Secret — Sir Francis learns from his mother that his father had fascist connections during the war. Characters: Sir Francis
Location: England
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House Invasion — Intruders search a residence for the diary but fail to find it; they plant a telephone bug.
Location: England residence
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Bug Investigation — Ferguson becomes suspicious and orders an inspection for surveillance devices. Characters: Charles Ferguson
Location: England residence
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Witness Interview — Ferguson interviews a witness connected to Baker, but the submarine's location remains unknown. Characters: Charles Ferguson
Location: England
The Reluctant Recruit
Charles Ferguson recruits Sean Dillon from a Yugoslavian prison by offering him a clean slate. Dillon returns to London and enters the official operation despite their history of betrayal.
Key Events
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Witness Interview — Ferguson interviews a witness connected to Baker, but the submarine's location remains unknown. Characters: Charles Ferguson
Location: England
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Dillon's Prison Bargain — Ferguson admits framing Dillon and offers him freedom in exchange for cooperation. Characters: Sean Dillon, Charles Ferguson
Location: Yugoslavian prison
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Return to London — Dillon leaves prison and returns to London under Ferguson's arrangement. Characters: Sean Dillon, Charles Ferguson
Location: Flight to London
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Dillon Joins Investigation — Ferguson introduces Dillon to the officials directing the investigation. Characters: Sean Dillon, Charles Ferguson, Sir Francis
Location: London meeting room
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Attack on the Witness — Dillon rescues a witness from an attack and forces an injured assailant to disclose his employer. Characters: Sean Dillon
Location: London street
Pursuit Across Waters
Dillon survives an attack and travels to the Caribbean to pursue the missing case. Surveillance, a shark attack, and a sabotaged seaplane reveal the reach of the opposing network.
Key Events
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Caribbean Pursuit Begins — Dillon travels to the Caribbean, obtains diving equipment and weapons, and reunites with Ferguson. Characters: Sean Dillon, Charles Ferguson
Location: Caribbean
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Bar Fight and Confession — A fight forces Dillon and Ferguson to explain the investigation to their local diving contact. Characters: Sean Dillon, Charles Ferguson
Location: Caribbean bar
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Shark Attack Dive — Dillon survives a dive pursued by hostile divers and discovers a bug on the boat. Characters: Sean Dillon
Location: Caribbean waters
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Informer Identified — Dillon and Ferguson learn that Sir Francis has been passing information and discover his motive. Characters: Charles Ferguson, Sir Francis
Location: Caribbean
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Sabotaged Seaplane — Dillon and Ferguson nearly die when their seaplane has been sabotaged. Characters: Sean Dillon, Charles Ferguson
Location: Caribbean seaplane
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Investigator Murdered — Ferguson learns that the inspector investigating Sir Francis has been killed and vows revenge. Characters: Charles Ferguson
Location: London
Thunder Point Reckoning
Baker's boat log identifies Thunder Point, enabling a dangerous dive for the second case. Dillon retakes the case, destroys the enemy ship, confronts Sir Francis, and accepts Ferguson's offer.
Key Events
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Investigator Murdered — Ferguson learns that the inspector investigating Sir Francis has been killed and vows revenge. Characters: Charles Ferguson
Location: London
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Thunder Point Located — Baker's log identifies Thunder Point as the location of U-boat 180. Characters: Sean Dillon, Charles Ferguson, Henry Baker
Location: Henry Baker's boat
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Witness Tortured — A witness is tortured for the submarine's location and escapes by jumping through a balcony door.
Location: Witness's house
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Nighttime U-Boat Dive — Dillon completes a dangerous night dive, enters the submarine, retrieves the second case, and escapes. Characters: Sean Dillon
Location: Thunder Point
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Case Seized — An enemy operative attacks Ferguson and takes possession of the recovered case. Characters: Charles Ferguson
Location: Caribbean
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Ship Destroyed — Dillon retakes the case, kills the leading enemy operative, and destroys the ship. Characters: Sean Dillon
Location: Caribbean ship
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Final Confrontation — Dillon and Ferguson confront Sir Francis; Sir Francis attempts murder and is killed. Characters: Sean Dillon, Charles Ferguson, Sir Francis
Location: England
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Dillon Accepts Service — Ferguson offers Dillon a job, and Dillon accepts. Characters: Sean Dillon, Charles Ferguson
Location: England