Very Special Agent Fifi was described as one of the most expert liars in the world . Employed by the Special Operations Executive (SOE), Churchill s wartime spook organisation, her job was to entrap trainee agents and test their mettle in the field.Kept secret for seventy-five years, her existence long treated as a myth, Fifi s files were declassified in 2014 and her identity revealed. She was Marie Chilver, a half-Latvian, half-British escapee from occupied Europe. Marie s extraordinary story reveals the inner workings of Britain s secret services and the lengths the SOE would go to in equipping their agents for their highly dangerous espionage work in Nazi-dominated Europe.