The only book to examine these top- secret air missions in detail, written by experts with vast first- hand knowledge Between 1945 and 1990 the British Government mounted some of the most successful intelligence operations of the Cold War. Conducted in secrecy, aircrews flew modified light aircraft to gather intelligence on the Soviet and East German military targets that surrounded Berlin. Flying through designated air corridors, they gathered huge amounts of imagery and helped maintain the balance of power between east and west. For the first time, using recently declassified materials and extensive interviews with those involved, this book provides a detailed account and analysis of these operations and their unique contribution to the Cold War intelligence picture.