This volume covers European intelligence in the first half of the 20th century. It reveals that the Imperial German Government had a remarkable source at the Russian Embassy in London prior to the outbreak of the World War I; describes in detail Swedish-German cryptanalytical co-operation during the Great War in intercepting and solving Russian diplomatic telegram traffic; adds an intriguing new twist to the murder of the Tsar and his family; provides an authoritative account of Swedish cryptanalytical success against German and Soviet traffic during the World War II; and includes an anecdote suggesting that Allied security surrounding Overlord may have in fact been breached, while at the same time offering a reason as to why this leak led nowhere.

This volume offers an account of some key activities of the Allied secret services and their German counterparts in Sweden during World War II. It also describes in some detail Swedish wartime legislation and Swedish organizations concerned with internal security and intelligence.

A history of Swedish interception of radio and telegraph messages during World Wars I and II providing a valuable background to Swedish military operations at this time. This should prove a valuable work for anyone interested in the intelligence systems at work during wartime.