Spy fiction can be seen as a genre in its own right but it also intersects with Invasion and Future War literature especially in the late 19c / early 20C.
A good introduction is available at: Encyclopedia of Espionage, Intelligence, and Security at http://www.faqs.org/espionage/In-Int/Intelligence-Literature.html
Le Queux, E. Phillips Oppenheim and Erskine Childers novels are discussed in LeRoy L. Panek’s (1981) Special Branch : the British Spy Novel, 1890-1980
The BFI has a good description of early invasion-scare and spy films building upon the success of invasion and espionage literature at: http://www.screenonline.org.uk/film/id/1114408/
A down to earth description of the reality of the extent of spying is provided by The National Archives and also by Sidney Theodore Felstead (1920) in German Spies at Bay – Being an Actual Record of the German Espionage in Great Britain during the years 1914-1918
There is material on Edwardian Spies and Literature in the Edwardian Promenade website at http://www.edwardianpromenade.com/category/espionage/
A detailed academic discussion on the background to the literature and historical context is available in Hampshire, J. (undated) “‘Spy Fever’ in Britain, 1900 to 1914.” Historian, Historical Association http://www.history.org.uk/resources/student_resource_596_107.html (subscription required)
Hitchner, T. A. (2010) Espionage literature and the training of the modern British hero .(Details in Secondary Sources – Academic Theses)
Stafford, D. A. T. (1981). “Spies and gentlemen: the birth of the British spy novel, 1893-1914.” Victorian Studies 24: 489.
Price, T. J. (1996). “Spy Stories, Espionage and the Public in the Twentieth Century.” Journal of Popular Culture 30(3): 81-89.
Moran, C. R. and Johnson, R. (2010) “In the Service of Empire: Imperialism and the British Spy Thriller 1901–1914”, Studies in Intelligence Vol. 54, No. 2 (June 2010)
Kemp, S., et al. (2005). Spies of the Kaiser: Plotting the Downfall of England. The Oxford Companion to Edwardian Fiction, Oxford University Press.
Kemp, S. and C. M. D. Trotter (2005). Spy fiction. The Oxford Companion to Edwardian Fiction, Oxford University Press.
Knightley, P. (2013) “Working for us or themselves?”, British Journalism Review, Vol. 24, Issue 4 December 2013
Nicholas Hiley has published a series of papers on the reality of Anglo-German espionage activity:
Hiley, N. (1983), ‘The Failure of British Espionage against Germany, 1907-1914’, Historical Journal, Vol. 26, No. 4 (1983): 867-889.
A climate of spy-hysteria dominated not only public discourse in England in the period 1907-14, but also the counsels of the War Office’s German intelligence subsection, whose officers remained convinced that the Germans were planning an invasion of England despite the naval infeasibility of such a plan. They convinced themselves on flimsy evidence that the few genuine German spies in England were only a small part of a vast network doing advance work for the German assault. Their self-delusion fostered public fear and distrust of the Germans.
Hiley, N. (1985), ‘The Failure of British Counter-Espionage against Germany, 1907-1914’, Historical Journal, Vol. 28, No. 4 (1985): 835-862.
The nearly complete failure of British military intelligence to alert Britain to German preparations for World War I, including the possibility of Germany’s invading Great Britain, was due to the extraordinary restraints placed on British spies and intelligence services. They were limited to answering specific questions, which were not often relevant to pertinent information.
Hiley, N. (1988), ‘Spying for the Kaiser’, History Today, No. 6 (1988): 37.
Popular obsession with German espionage in the early 1900s proved to be well-founded, as Nicholas Hiley shows in an examination of the pre-war activities of a group of agents controlled by the ‘Kaiser’s Spymaster’.
Hiley, N. (2006), ‘Entering the Lists: Mi5’s Great Spy Round-up of August 1914’, Intelligence & National Security, Vol. 21, No. 1 (2006): 46-76.
One of the most famous successes of the British Security Service, popularly known as MI5, was its great spy round-up of August 1914. According to all previous histories, official and unofficial, Vernon Kell, the first head of MI5, masterminded the arrest of 21 out of the 22 German agents working in Britain, crippling the German intelligence network within hours of the outbreak of the First World War. The event is still celebrated by MI5, but a careful study of the recently-opened records shows it to be a complete fabrication. This article examines the six surviving lists of suspects to show how and why MI5 created and perpetuated this remarkable lie.
Hiley, N. (2010), ‘Re-Entering the Lists: Mi5’s Authorized History and the August 1914 Arrests’, Intelligence & National Security, Vol. 25, No. 4 (2010): 415-452.
The 2009 Authorized History of MI5 carried a new defence of its August 1914 operation, in which Vernon Kell, its first Director, supposedly scored a coup by capturing all 21 German agents working in Britain. The Authorized History went against the version of events given in my article ‘Entering the Lists’, published by this journal in 2006, and backed up its case with a new arrest list. This article considers that new list, and its supposed origins in an MI5 document from 1931. Once again it demonstrates the impossibility of turning MI5’s foundation myth into history, by showing that not only is the account in the Authorized History internally inconsistent, but the arrest list consists of 22 names arbitrarily selected from later case summaries, then wrongly footnoted to an MI5 document which contains a different list of 21 names. Indeed, by claiming authority from the only arrest list known to have been challenged within MI5 itself, the Authorized History merely reinforces the conclusion that Kell fabricated his most famous victory.
Other Works on Historic Aspects of Espionage
Andrew, C. (2009) The Defence of the Realm: The Authorized History of MI5
Atkins, J. (1984) The British Spy Novel
Denning, M. (1987) Cover Stories: Narrative and Ideology in the British Spy Thriller
Knightley, P. (2003) The Second Oldest Profession – Spies and Spying in the Twentieth Century
Morton, J. (2010) Spies of the First World War – Under Cover for King and Kaiser
Stafford, D. (2013), The Silent Game: The Real World of Imaginary Spies
Wade, S. (2007) Spies in the Empire: Victorian Military Intelligence
Wade, S. (2009) Victoria’s Spymasters: Empire and Espionage
Wark, W.K. (1991) Spy Fiction, Spy Films and Real Intelligence
Woods B. F. (2007), Neutral Ground: A PWoods B. F. (2007), Neutral Ground: A Political History Of Espionage Fictionolitical History Of Espionage Fiction
For examples of Life imitating Art in espionage see this account of ‘spies’ arrested in Germany