EP1 The Mysterious Death on the Underground RailwayJan 29, 1973
Polly Burton assists in soving the case of a grl found dead on a seat of an underground train.
EP2 Five Hundred CaratsFeb 05, 1973
Inspecor Lipinski investigates the theft of a 500 carat diamond.
EP3 Cell 13Feb 12, 1973
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.
EP4 The Secret of the ManifiqueFeb 19, 1973
Laxworthy and two friends secure the safety of the plans for the first torpedo to be used by the French navy.
EP5 The Absent-Minded CoterieFeb 26, 1973
Valmont has to help break a ring of counterfeiters.
EP6 The Sensible Action of Lieutenant HoistMar 04, 1973
Lieutenant Holst of Copenhagen has to help a Russian countess who claims her brother-in-law aims to kill her.
EP7 The Superfluous FingerMar 11, 1973
Professor Van Dusen must find out why a young woman had a perfectly healthy finger cut off by the eminent surgeon Prescott.
EP8 Anonymous LettersMar 19, 1973
In turn-of-the-century Vienna, Dagobert Trostler investigates a poison pen case.
EP9 The Moabite CypherMar 26, 1973
Dr Thorndyke has to decypher a code to stop a plot to assassinate a Russian Grand Duke.
EP10 The Secret of the FoxhunterApr 02, 1973
William Drew of the foreign Office investigates an unusual crime.
EP11 The Missing Q.C'sApr 09, 1973
Charles Dallas is led into a strange and sinister adventure in the aftermath of a sensational murder trial.
EP12 The Looting of the Species RoomApr 16, 1973
Gold disappears from the strongroom of the RMS Oceanic and its purser, Mr Horrocks, tries to discover what has happened.
EP13 The Mystery of the Amber BeadsMay 07, 1973
Hagar the Gypsy sets out to prove that Detective Sergeat Grubber is wrong about who killed Mrs Arryford.