This review essay provides a critical assessment of a book published in 2012 by Igor Lukes, On the Edge of the Cold War: American Diplomats and Spies in Postwar Prague. Lukes's aim in the book is to explain why the United States failed to prevent Czechoslovakia from being absorbed into the Soviet bloc after the Second World War. Although the book is highly readable and contains useful information, it is professionally unbalanced. Lukes's generally acceptable conclusions are undermined by numerous factual and methodological mistakes. These flaws stem from Lukes's frequently insufficient historical critique of his sources, his neglect of other important documentation, and his tendency to ignore much of the relevant historical literature.