An anthology series produced by Thames Television, comprised of short mystery, suspense or crime adaptations featuring, as the title suggests, detectives who were literary contemporaries of Arthur Conan Doyle's Sherlock Holmes.

When Lucy Honeychurch and chaperon Charlotte Bartlett find themselves in Florence with rooms without views, fellow guests Mr Emerson and son George step in to remedy the situation. Meeting the Emersons could change Lucy's life forever but, once back in England, how will her experiences in Tuscany affect her marriage plans?

The year is 1914 and Richard Hannay, Mining Engineer who is visiting Britain for a short time before returning to South Africa, is shocked when one of his neighbours, Colonel Scudder, bursts into his rooms one night and tells him a story that Prussian 'sleeper' agents are planning to pre-start World War I by murdering a visiting foreign minister. However, Scudder is murdered and Hannay is framed for the death by the 'sleepers'. Fleeing to Scotland Hannay attempts to clear his name and to stop the agents with the aid of Alex Mackenzie but not only is he is chased by Chief Supt Lomas for Scudder's death but by the agents who are headed by Appleton who has managed to hide himself in a high-placed position in the British Government...

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Michael Marler, a successful businessman in London, is about to make his way to the top. After 37 years, the death of his father brings him back to his hometown of Liverpool, where he’s confronted with his lost Irish roots. He finds out that his father died in a fight with some Anglo-Saxon teddy boys. It becomes a matter of honour for him to take his revenge without involving the police.

In 1956, the ultra-respectable seaside resort of Eastbourne was shocked when a local doctor, John Bodkin Adams, was arrested for murdering one of his elderly patients.

Elizabeth is a historian who believes that she is on to the find of her career, but has difficulty getting access to the document that will prove her theory. In desperation, she and a friend decide to break into the owner's house. She successfully gets in but is unexpectedly caught by the owner. She and the friend have to make up a story to get them out of trouble which eventually leads to string of events that lands Elizabeth in even more hot water.