Helen Fry, one of our foremost intelligence historians, talks to Steven Gale about her new book The White Lady in which she reveals the story of two key British Secret Service networks behind German lines during the First and Second World Wars. Could Britain have won without the help of these courageous agents?

Helen Fry is the author of The Walls Have Ears; Spymaster: M19; Women In Intelligence; and more than 20 other books on intelligence, prisoners of war, and the social history of the Second World War. She appears regularly in media interviews, podcasts, and has been involved in numerous documentaries.

Photo © Greg Morrison