On 23 August 2010, the body of Gareth Williams, a 31-year-old GCHQ mathematician seconded to MI6, was found inside a padlocked red holdall in the bathroom of his London flat at Pimlico. The bag was locked from the outside, the flat showed no signs of forced entry, and no fingerprints were found on the lock.

Williams had been working on highly sensitive intelligence operations. What initially appeared inexplicable quickly became controversial. Police found no clear evidence of third-party involvement, yet the circumstances defied easy explanation. In 2012, a coroner ruled his death unnatural, but returned an open verdict, leaving the central question unresolved.

In this episode, we examine Gareth Williams's life, the discovery of his body, the official explanations, and why the "Spy in a Bag" case remains one of Britain's most disturbing modern mysteries.

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