Though Deutscher (1907–1967) and Berlin (1909–1997) had much in common—each arrived in England in flight from totalitarian violence, quickly mastered English, and found entry into the Anglo-American intellectual world of the 1950s—Berlin became one of the presiding voices of Anglo-American liberalism, while Deutscher remained faithful to his Leninist heritage, resolutely defending Soviet conduct despite his rejection of Stalin’s tyranny. Caute combines vivid biographical detail with an acute analysis of the issues that divided these two icons of Cold War politics, and brings to light for the first time the full severity of Berlin’s action against Deutscher.