Photo by: Sylvia Coury


Welcome to the official site of historian Dr Helen Fry.


Helen has written and edited over 25 books. Her works cover the social history of the Second World War: British Intelligence and the secret war; spies and espionage; and MI9 escape and evasion.


Helen continues to bring fresh insight into the clandestine operations of WWII, including widespread coverage of the greatest deception of the war: the bugging of Hitler’s generals at Trent Park, North London.


Helen lives and works in London.

She is an ambassador for the Museum of Military Intelligence at Milton Bryan in Buckinghamshire

Because of her expertise in British Intelligence in WW1 and WWII, she has been involved in a number of documentaries – including David Jason’s Secret Service.

She has conducted advisory work for TV and drama; something which she particularly enjoys, as well as numerous radio broadcasts.


Helen has also written extensively about the 10,000 Germans who fought for Britain in WWII.

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If you have interesting spies stories of WWII in your family, please contact Helen. 


Helen is currently working on a new biography of MI6 spymaster Thomas Joseph Kendrick for publication with Yale in 2021.

If you have any link to any subjects on the website or have archival material, please contact Helen here.

LATEST BOOK RELEASE: MI9: The Secret Service for Escape and Evasion in WWII 



Walls Have Ears cover.jpg

Helen's latest book 'The Walls Have Ears' is out in paperback soon!

At the outbreak of World War Two, MI6 spymaster Thomas Kendrick arrived at the Tower of London to set up a top secret operation: German prisoners' cells were to be bugged and listeners installed behind the walls to record and transcribe their private conversations.


This mission proved so effective that it would go on to be set up at three further sites - and provide the Allies with crucial insight into new technology being developed by the Nazis. In this astonishing history, Helen Fry uncovers the inner workings of the bugging operation.


On arrival at stately-homes-turned-prisons like Trent Park, high ranking German Generals and commanders were given a `phoney' interrogation, then treated as `guests', wined and dined at exclusive clubs, and encouraged to talk. And so it was that the Allies got access to some of Hitler's most closely guarded secrets - and from those most entrusted to protect them.

If this short overview has captured your imagination on what went on behind the walls of those country houses: