This chapter will first consider the odd relationship that existed between the British Secret Intelligence Service (SIS) and the American Office of Strategic Services (OSS) and its successor, the Central Intelligence Agency (CIA), during the waning days of World War II and the beginning of the Cold War. In addition to surveying a number of pertinent memoirs and biographies, it will examine fictional accounts of espionage. The lion's share of the analysis will be devoted to John le Carré's classic espionage novel Tinker, Tailor, Soldier, Spy, published in 1974. The novel, which has recently been made into a feature film starring Gary Oldman and Colin Firth, underscores the underlying distaste, widely felt in the SIS, for the American role in intelligence-gathering during this period. To be sure, this was not a majority view. Despite some embarrassing moments, both the United Kingdom (UK) and United States (US) were able to work together productively, for the most part, to track down the Nazis and Soviets who were working against the Allies. But the dissimilarity in the two nations' approaches to espionage and special operations was sufficiently pronounced to become part of recently written histories of the period and healthy fodder for spy fiction.