Monday, August 23rd, 2010, officers from the central London police force visited the home of Gareth Williams at his top-floor flat on Alderney Street in Pimlico, London.

Gareth had been working as a communications officer at the Government Communications Headquarters in Cheltenham. The cypher and codes expert was seconded to the secret intelligence service headquarters on the bank of the Thames around half a mile from his home.

When Gareth didn’t turn up for work, his colleagues made attempts to track him down, however, when that failed the authorities were notified. Police arrived at Gareth’s home, and after receiving no response, they broke down the front door of his flat. They spotted a mobile phone and sim cards laid out on a tabletop.

As they entered the bathroom, they noticed a large red North Face sports bag in the bath. They unzipped the padlocked bag, and Gareth’s decomposing body was found inside.

But how did it get there? Did Gareth lock himself inside or had he been murdered and his body placed there?

*** LISTENER CAUTION IS ADVISED AS THIS EPISODE CONTAINS ADULT THEMES AND DESCRIPTIONS THAT SOME LISTENERS MAY FIND DISTRESSING ***