An illustrated account of the intelligence services operating in Cold War Berlin. For almost half a century, the hottest front in the Cold War was right across Berlin. From summer 1945 until 1990, the secret services of NATO and the Warsaw Pact fought an ongoing duel in the dark. Throughout the Cold War, espionage was part of everyday life in both East and West Berlin, with German spies playing a crucial part of operations on both sides: Erich Mielke's Stasi and Reinhard Gehlen's Federal Intelligence Service, for example.