The Surest Poison

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The Surest Poison
Big Finish Productions audio drama
Series 'Sapphire & Steel'
Release no. 2.2
Written by Richard Dinnick
Directed by Nigel Fairs
Produced by Jason Haigh-Ellery
Nigel Fairs
Length 120 mins

The Surest Poison is a Big Finish Productions audio drama based on the popular British science fiction television series Sapphire & Steel.


An auction of timepieces, a 156-year-old man, the theft of the greatest watch ever built and its creator, the greatest watchmaker of all: all linked across history. Time has a plan, one with cataclysmic consequences for humanity unless Sapphire and Steel can stop it.



  • Both Sapphire and Gerard stated that Marie Antoinette was dead by 1790. In reality, she was executed on October 16, 1793.

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