At the outbreak of the World War I there was no formal organization for the transport of spies across enemy lines by aircraft and no communications network between the air forces and their agents. The exploits of British and Commonwealth, American, Free European, Soviet, German, Italian and Japanese airmen and units are recorded in this account. AUTHOR: David Oliver was founding editor of Air Forces Monthly. He has written widely on aspects of historical and contemporary aviation, including The Great Book of Bombers (2002), RAF Fighter Command (2000) and How to Fly and Fight Spitfire (1999). He lives in Herefordshire.