World War II has ended but now two new worlds face each other as Berlin is split into east and west. A secret war brews beneath the surface as both the CIA and the KGB work to establish their influence and impose their ideology in the capital. For 50 years, Berlin was the symbol of the Cold War, the city at the heart of the intelligence war between the US and the Soviet bloc. Thousands of KGB and CIA agents observed each other and worked as cogs in the biggest information war and one of the greatest espionage battles in history. This hour-long documentary is directed by David Muntaner.