This episode features Dr Thorndyke, played by John Neville, who is first a medical man and second a solver of mysteries. A young girl has been murdered in her boarding house and the solution looks obvious - but is it? Neville plays the sleuth with aplomb and this is a strong opening episode. The character is arrogant, capable, and likable - and of course his intelligence makes his police colleagues and/or adversaries look like idiots!

Bernard Sutton is called in to help stop a series of jewel robberies.

Simon Carne devises an ingenious way of keeping the Duchess of Wiltshire's diamonds safe from theft.

Arthur Hewitt and Jonathan Pride band together to find a bank clerk who has disappeared with £ 15,000.

Max Carrados, the blind detective, solves the case of a bank teller shot at his counter.

Arhtur Hewitt gets mixed up in a case involving voodoo and the disappearance of a dead body.

Lady Molly of Scotland Yard solves the murdeer of a respectable man.

Carnacki solves the case of an invisible horse that is haunting a family of the eve of a wedding.

Dixon Duce helps solve a murder case.

Conman and invesigator Romney Pringkle exposes a swindle and makes a profit.

Horace Dorrington clears up the mystery of the theft of a valuable diamond.

Jonathan Pride gets involved in a case involving a secret weapon, an eccentric inventor and forged roubles.

Horace Dorrington solves the mystery of a case of sabotage on a bicycle track.

Polly Burton assists in soving the case of a grl found dead on a seat of an underground train.

Inspecor Lipinski investigates the theft of a 500 carat diamond.

Professor Van Dusen, the 'Thinking Machine', boasts that he can think his way out of a prison cell. When he is locked up he is given the chance to prove that he can escape by the power of his mind alone.

Laxworthy and two friends secure the safety of the plans for the first torpedo to be used by the French navy.

Valmont has to help break a ring of counterfeiters.

Lieutenant Holst of Copenhagen has to help a Russian countess who claims her brother-in-law aims to kill her.

Professor Van Dusen must find out why a young woman had a perfectly healthy finger cut off by the eminent surgeon Prescott.

In turn-of-the-century Vienna, Dagobert Trostler investigates a poison pen case.

Dr Thorndyke has to decypher a code to stop a plot to assassinate a Russian Grand Duke.

William Drew of the foreign Office investigates an unusual crime.

Charles Dallas is led into a strange and sinister adventure in the aftermath of a sensational murder trial.

Gold disappears from the strongroom of the RMS Oceanic and its purser, Mr Horrocks, tries to discover what has happened.