Dublin, home of librarian Richard Hayes, and the known landing zones of Nazi spies during World War II.
Colonel Dan Bryan, Director of Irish Military Intelligence G2, 1941–1952 (Courtesy of the Military Archives of Ireland/Defence Forces).
James ‘Jim’ O’Donovan, IRA Head of Munitions and Chemicals. He set up the IRA–Nazi Link.
Ernst Weber-Drohl, circus strongman and Abwehr spy (Courtesy of the National Library of Ireland).
Eduard Hempel, German Minister to Ireland between 1937 and 1945 in the build-up to and during the Emergency (Photo courtesy of Dr David O’Donoghue, Hitler’s Irish Voices: The Story of German Radio’s Wartime Irish Service).
Site of the former German Legation in Ballsbridge where Eduard Hempel operated an illegal wireless transmitting set.
Captain John Patrick O’Sullivan, an Irish Army Signals Officer who monitored the German Legation from listening stations in Collins Barracks and his home in Chapelizod.
Guy Liddell, MI5’s Director of Counter-Espionage during World War II (© Bettmann/Getty Images).
Dr Richard Hayes, Director of the National Library of Ireland during World War II. He was also Ireland’s most prolific and brilliant codebreaker, as well as a formidable interrogator of captured German spies.
The Hayes family on a trip to Greystones. Pictured (left to right) Richard, Faery, Mervyn, Jimmy, Clare and Bertie. Joan is behind the camera.
A Heinkel He111 plane was used by the Abwehr to drop Hermann Görtz and Günther Schütz into Ireland.
Dr Hermann Görtz in Luftwaffe uniform (Courtesy of the National Archives uk).
Abwehr headquarters, 76–78 Tirpitzufer Berlin (© imageBROKER/Alamy Stock Photo).
G2 headquarters during the Emergency, North Circular Road, as they stand today.
Laragh Castle, Co. Wicklow (© National Inventory of Architectural Heritage).
7 Spencer Villas, Glenageary. Görtz’s safe house and home of the Farrell sisters.
Operation Green invasion map for Buncrana and Rathmullan, Co. Donegal (Courtesy of the Military Archives of Ireland/Defence Forces).
Operation Green invasion map for Galway city (Courtesy of the Military Archives of Ireland/Defence Forces).
Hans Marschner, fake South African passport used by Günther Schutz (Courtesy of the Military Archives of Ireland/Defence Forces).
Hans Marschner, aka Sgt Günther Schütz, Abwehr agent (Courtesy of the Military Archives of Ireland/Defence Forces).
A wanted poster from An Garda Síochana for Hans Marschner, aka Sgt Günther Schütz, following his escape from Mountjoy Prison in 1942 (Courtesy of the Military Archives of Ireland/Defence Forces).
Burnt fragments of the Görtz cipher, reconstructed on glass plates by Dr Richard Hayes (Courtesy of the National Library of Ireland).
Hayes’s codebreaking notes on the Görtz cipher (Courtesy of the National Library of Ireland).
Hermann Görtz’s handwritten cipher notes for coding messages (Courtesy of the National Library of Ireland).
Hermann Görtz’s handwritten cipher notes for coding messages (Courtesy of the National Library of Ireland).
‘Konstanz’, 245 Templeogue Road, home of Stephen Carroll Held and safehouse used by Hermann Görtz.
A wanted poster from An Garda Síochana for SD agent John Francis O’Reilly, following his escape from Arbour Hill Prison (Courtesy of the Military Archives of Ireland/Defence Forces).
Herman Görtz’s mugshot following his arrest in 1943 at 1 Blackheath Park, Clontarf (Courtesy of the Military Archives of Ireland/Defence Forces).
Students on the roof of TCD on VE Day, Dublin. The Union Jack was later burned by a group of students led by Charles J. Haughey (Courtesy of the National Library of Ireland).
The funeral of Hermann Görtz, Deansgrange Cemetery, 1947 (© Topfoto).
Görtz’s headstone, carved himself during his imprisonment.
Grave of Herman Görtz, German Military Cemetery, Glencree, Co. Wicklow.
Dr Richard Hayes with books at his desk in the National Library of Ireland.
Dr Richard Hayes in later life.
St. Bricin’s Military Hospital, where Görtz’s trousers were searched by Richard Hayes (Courtesy of the National Library of Ireland)
Dr Richard Hayes receiving an Honorary Doctorate for his published work.