Hear again from British historian Helen Fry, joining Rhiannon Neads for the second and final installment of a two-part dive into one of the most crucial, but little-known intelligence forces of the Second World War - MI9.

Hear the conclusion to the gripping story of the department, and reasons behind their ultimate secrecy in a post-WW2 world...

From SPYSCAPE, the HQ of secrets. A Cup And Nuzzle production. Series producer: Joe Foley. Produced by Max Bower.

Learn more about your ad choices. Visit megaphone.fm/adchoices