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E1 Case of the Reluctant Widow
If it was murder, who was responsible? The dead man's wife, Julie? The young cafe assistant, Clive? Sergeant Cork, one of the pioneers of the newly formed C.I.D., applies his unique methods of detection to the case.
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E2 The Case of the Girl Upstairs
Lucy Beasley is certain that a crime is being committed in the Beasley household and she implores Cork to investigate. Is she a bitter, frustrated woman out to cause trouble, or are her fears justified?
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E3 The Case of the Two Drowned Men
When Cork and Marriott begin their investigations to find two criminals wanted for murdering a bank messenger; a tip off takes them to the London waterfront, where they uncover a sordid riverside trade.....
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E4 The Case of the Knotted Scarf
Cork and Marriott are called in to investigate the murder of a retired general's young wife, found strangled in a derelict bungalow in the grounds of an old country house is Devonshire.
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E5 The Case of the Stagedoor Johnnie
Kate Seymour, a young star of the music hall, receives poison pen letters threatening her engagement to John Stratton, a stagedoor Johnnie.
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E6 The Case of the Respectable Suicide
Cork and Marriott are called in to investigate what appears to be a case of suicide when Mr Bertram, a respectable and deeply religious man, is found dead by his housekeeper, Mrs Holland.
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E7 The Case of the Slithy Tove
An urchin sees a mysterious gentleman visiting Trumble, an ex-criminal, in his slum house. When Trumble is later found dead, the urchin goes to Cork.
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E8 The Case of the Persistant Assassin
Prince Frederick of Silecia arrives in London on a trade mission for his country. Cork is made responsible for his safety, and faces the problem of discovering those who are plotting the Prince's assassination.
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E9 The Case of the Sleeping Coachman
In spite of opposition from the Melrose family, Cork is determined to discover the murderer of a laundry maid, whose body is found in their stable by a drunken coachman.
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E10 The Case of the Soldier's Rifle
A strike at a factory; the army is called in to keep order, and during a riot outside the gates a striker is shot. Accident or murder?
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E11 Case of the Public Paragon
Cook is summoned when an up-and-coming politician is murdered. His wife and the maidservant found a burglar standing over his body, but they are unable to distinguish any of his features.
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E12 The Case of Ella Barnes
Ella Barnes - a sewing girl from the East End of London - is found drowned in a canal. At the inquest, however, it is revealed that she had been attacked before she drowned.
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E13 The Case of the Gold Salesmen
Klein, a money lender, suspects fraud when a man called Carylon offers to sell him gold bars at a cut price. He calls in Cork and Marriott, who set a trap to discover whether Klein's suspicions are justified.