• List of Episodes (21)
    • 1. The Mysterious Death on the Underground Railway

      29 Jan '73
      Polly Burton assists in soving the case of a grl found dead on a seat of an underground train.
    • 2. Five Hundred Carats

      05 Feb '73
      Inspecor Lipinski investigates the theft of a 500 carat diamond.
    • 3. Cell 13

      12 Feb '73
      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.
    • 4. The Secret of the Manifique

      19 Feb '73
      Laxworthy and two friends secure the safety of the plans for the first torpedo to be used by the French navy.
    • 5. The Absent-Minded Coterie

      26 Feb '73
      Valmont has to help break a ring of counterfeiters.
    • 6. The Sensible Action of Lieutenant Hoist

      04 Mar '73
      Lieutenant Holst of Copenhagen has to help a Russian countess who claims her brother-in-law aims to kill her.
    • 7. The Superfluous Finger

      11 Mar '73
      Professor Van Dusen must find out why a young woman had a perfectly healthy finger cut off by the eminent surgeon Prescott.
    • 8. Anonymous Letters

      19 Mar '73
      In turn-of-the-century Vienna, Dagobert Trostler investigates a poison pen case.
    • 9. The Moabite Cypher

      26 Mar '73
      Dr Thorndyke has to decypher a code to stop a plot to assassinate a Russian Grand Duke.
    • 10. The Secret of the Foxhunter

      02 Apr '73
      William Drew of the foreign Office investigates an unusual crime.
    • 11. The Looting of the Species Room

      09 Apr '73
      Gold disappears from the strongroom of the RMS Oceanic and its purser, Mr Horrocks, tries to discover what has happened.
    • 12. The Mystery of the Amber Beads

      16 Apr '73
      Hagar the Gypsy sets out to prove that Detective Sergeat Grubber is wrong about who killed Mrs Arryford.
    • 13. The Missing Q.C's

      07 May '73
      Charles Dallas is led into a strange and sinister adventure in the aftermath of a sensational murder trial.
    • 19. The Sensible Action of Lieutenant Holst

      04 Mar '73
    • 20. The Superfluous Finger

      11 Mar '73
    • 21. Anonymous Letters

      18 Mar '73
    • 22. The Moabite Cypher

      26 Mar '73
    • 23. The Secret of the Foxhunter

      02 Apr '73
    • 24. The Missing Q.C.s

      09 Apr '73
    • 25. The Looting of the Species Room

      16 Apr '73
    • 26. The Mystery of the Amber Beads

      23 Apr '73