A London curator loses the Mona Lisa to a collector, who discovers it's a fake.

Inspector Cork pursues a bank robber who serves in the army and receives facial injuries. After plastic surgery he shows up as a bank president planning an enormous robbery.

Sir James Blake has retired from Scotland Yard so that he can assist his niece Hope and her friend Jerry in developing an apparatus they have invented. Sir James thinks that their invention has the potential to prevent wars, and plans to donate it to the League of Nations. But a gang of criminals led by the elusive "Scorpion" steals the device, and Blake and his associates must recover the invention and determine the identity of the "Scorpion".

In 1918, when Germany lost the war, it blamed its defeat on the efficiency of Room 40, in the Old Building of the British Admiralty---the room in which German wireless message were intercepted and decoded. German then decided to train a clever spy who would be solidly entrenched in Room 40, whenever the next war came. In 1939 John Usher (Edgar Barrier)is acknowledged the genius of Room 40. His fiancée, Sudan Ainger (Stephanie Bachelor)is also working in Room 40. John's ten-year-old son, David (Bobby Cooper),at school in Switzerland is called home. The night before DAvid arrives home, John is murdered, but his twin brother Robert (Edgar Barrier),impersonates John and continues his work. Only Sir Christopher (C. Aubrey Smith)and David know of the plan. The safety of six high-ranking British officers who are taking a plane to Warsaw, depends on decoding Nazi messages.But the Nazis switch codes and solution seems impossible.

A federal agent joins forces with a British lawman to foil a spy ring.

A doctor uses his unique medical knowledge to mastermind a lucrative life-insurance scam; in a rare film role, legendary thespian Gerald du Maurier stars as the Metropolitan Police Commissioner who sets out to uncover the secret of five empty coffins and catch the villainous swine responsible for such depravities.

Three stories based on real Scotland Yard cases: The Lady's Companion; The Telephone; The Interrogation.

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Colonel March of The Department of Queer Complaints investigates unusual cases, locked-room murders, and mysteries concerning the supernatural.

1971 NBC documentary by Frank Cvitanovich profiling the various elements of the Metropolitan Police, from the Black Museum to modern riots, to anti-paedophile campaigns.