The Secret War Between the Wars MI5 in the 1920s and 1930s by Kevin Quinlan
[PDF file]: […] handling of the very significant Tyler Kent/Right Club events which might have had a serious impact on WW2, delaying American entry; and the careful debriefing of Soviet intelligence defector Krivitsky, the first of its kind. Versions of these events, based on the same files, are in Christopher Andrew’s Defence of the Realm and had […]