Published: March 25, 2020, 12:01 a.m.
This week's episode is a two parter - both parts will be released simultaneously.
Part one looks at the mysterious death of Gareth Williams, a British spy whose body was discovered in a bag, which had been placed in the bath of his home in Pimlico, South West London.
It's a real head scratcher. This episode focuses on Gareth's life, his time at GCHQ in Cheltenham, where he worked before moving on to MI6 in London. We look at the facts and the official ruling at his inquest.
In part two, we explore our own theories...