This Doctor Who story was first broadcast in six episodes in 1964. Episodes 4 and 5 are missing from the BBC archives,
This audio version was first released in 2005. It consists of a digitally remastered soundtrack (probably sourced from an off air recording) with linking narration provided by Carole Ann Ford.
The serial was written by Dennis Spooner who contributed several scripts to the series including co-writing, with Terry Nation, the epic The Daleks’ Master Plan. He also served as script editor from The Rescue to The Chase.
Despite his work on Doctor Who, Spooner is probably best known for his contributions to ITV series such as Thunderbirds, The Avengers, Department S and The Champions.
The TARDIS materialises not far from Paris in 1794 — one of the bloodiest years following the French Revolution of 1789. The travellers become involved with an escape chain rescuing prisoners from the guillotine and get caught up in the machinations of an English undercover spy, James Stirling — alias Lemaitre, governor of the Conciergerie prison.
This is an enjoyable historical adventure with good performances throughout especially from William Hartnell when the Doctor is impersonating a Regional Officer of the Provinces.
The audio can be downloaded here
although Audible to seem to have confused this version with the Target novelisation.