Air date: 1973-01-29

Runtime: 50 min

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

Air date: 1973-02-05

Runtime: 50 min

Inspecor Lipinski investigates the theft of a 500 carat diamond.

Air date: 1973-02-12

Runtime: 50 min

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.

Air date: 1973-02-19

Runtime: 50 min

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

Air date: 1973-02-26

Runtime: 50 min

Valmont has to help break a ring of counterfeiters.

Air date: 1973-03-04

Runtime: 50 min

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

Air date: 1973-03-11

Runtime: 50 min

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

Air date: 1973-03-19

Runtime: 50 min

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

Air date: 1973-03-26

Runtime: 50 min

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

Air date: 1973-04-02

Runtime: 50 min

William Drew of the foreign Office investigates an unusual crime.

Air date: 1973-04-09

Runtime: 50 min

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

Air date: 1973-04-16

Runtime: 50 min

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

Air date: 1973-05-07

Runtime: 50 min

Hagar the Gypsy sets out to prove that Detective Sergeat Grubber is wrong about who killed Mrs Arryford.