Story Structure — 5 Plot Phases
The Broken Code
Bletchley Park faces a blackout after the Nazi U-boats change a reference book for the Shark cipher. Tom Jericho returns from a nervous breakdown caused by his failed affair with Claire.
Key Events
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Wartime Bletchley Park — March 1943 frames Bletchley Park within the wider Second World War.
Location: Bletchley Park
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Shark Cipher Changes — The Nazi U-boats change a reference book used for Enigma ciphers.
Location: Bletchley Park
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Naval Intelligence Blackout — The changed cipher causes a blackout in vital naval signals intelligence.
Location: Bletchley Park
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Jericho Returns — Tom returns after a month recovering from a nervous breakdown. Characters: Tom Jericho
Location: Bletchley Park
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A Failed Love Affair — Tom's breakdown is linked to his failed love affair with Claire. Characters: Tom Jericho, Claire Romilly
Location: Bletchley Park
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Claire Has Disappeared — Tom seeks Claire and learns she disappeared several days earlier. Characters: Tom Jericho, Claire Romilly
Location: Bletchley Park
Claire's Vanishing Trail
Tom discovers that Claire has disappeared and turns to her housemate Hester for help. Together they follow clues connected to intercepts Claire stole.
Key Events
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Claire Has Disappeared — Tom seeks Claire and learns she disappeared several days earlier. Characters: Tom Jericho, Claire Romilly
Location: Bletchley Park
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Hester Joins Tom — Tom enlists Claire's housemate Hester to follow the clues. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Hester Wallace's home
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Stolen Intercepts — Tom and Hester identify intercepts stolen by Claire as key evidence. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park
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Following Claire's Clues — Tom and Hester follow clues to understand Claire's actions. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park
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Deciphering the Evidence — Tom and Hester work to decipher the stolen intercepts. Characters: Tom Jericho, Hester Wallace
Location: Bletchley Park
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The Cipher Must Be Rebroken — The cryptanalysts must break the changed Shark cipher again. Characters: Tom Jericho
Location: Bletchley Park
The Convoy Deadline
Tom and Hester attempt to decipher the stolen intercepts while the changed Shark cipher remains unreadable. The approach of U-boats toward a thirty-seven-ship convoy creates a deadline of less than four days.
Key Events
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The Cipher Must Be Rebroken — The cryptanalysts must break the changed Shark cipher again. Characters: Tom Jericho
Location: Bletchley Park
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A Convoy Under Threat — U-boats close in on a convoy of thirty-seven American ships.
Location: Atlantic convoy route
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Four-Day Deadline — The codebreakers have less than four days to restore access to the cipher. Characters: Tom Jericho, Hester Wallace
Location: Bletchley Park
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Claire's Motive Questioned — Tom and Hester investigate why Claire took the stolen intercepts. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park
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Personal Interest Emerges — The plot reveals that another person at Bletchley has a personal interest in the intercepts. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park
A Hidden Personal Interest
The investigation reveals that someone at Bletchley has a personal interest in the stolen intercepts. This possibility links Claire's disappearance to the wider intelligence crisis.
Key Events
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Personal Interest Emerges — The plot reveals that another person at Bletchley has a personal interest in the intercepts. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park
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The Investigation Tightens — The search for Claire becomes connected to the wider cipher crisis. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park
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U-Boat Pressure Escalates — The approaching U-boats increase the cost of failing to solve Shark. Characters: Tom Jericho, Hester Wallace
Location: Bletchley Park
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Suspected Responsibility — The investigators consider whether the interested Bletchley person caused Claire's disappearance. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park
The Converging Threats
Tom and Hester continue pursuing the cipher and Claire's disappearance as the naval danger escalates. The story brings the missing woman, stolen intelligence, and Shark deadline together.
Key Events
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Suspected Responsibility — The investigators consider whether the interested Bletchley person caused Claire's disappearance. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park
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Race Against Shark — Tom and Hester continue the investigation while the cipher deadline approaches. Characters: Tom Jericho, Hester Wallace
Location: Bletchley Park
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Unresolved Threats Converge — Claire's disappearance, the stolen intercepts, and the naval deadline converge at the story's endpoint. Characters: Tom Jericho, Hester Wallace, Claire Romilly
Location: Bletchley Park