Gareth Williams was a Welsh-born crypto-analyst who worked in London on secondment from the Government Communications Headquarters in Cheltenham. A week after he failed to show up for work at MI6, he was reported missing. Police discovered his body inside a locked sports bag in the bathroom of a government-leased apartment in Pimlico. Was this talented code-breaker’s death the work of international intelligence agencies – or perhaps something more personal?

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This True Crime Podcast was researched using open source or archive materials.