We tend to see Karl Popper from a later perspective of the years of the Cold War. And yet his roots explain a number of enigmas surrounding his work.This is a very compelling and very useful portrait of the early years of Karl Popper in the age of Wittgenstein's Vienna, and the interwar years. The background of Popper's The Poverty of Historicism, for example, lies in the methodological debates of this prior era, and the background given in the book greatly illuminates some of this classic's oddities. Popper's youth and formative years, when he was a socialist,and a socialist soon confronted by socialist theories in action, are brought out against the background of the extraordinary period after World War I and the calamities swiftly following one another. Through all of this we see Popper's distinctly uncharacteristic and yet brilliant development as he becomes a philosopher of science, in counterpoint to the logical positivists, with whom he was always confused. All this coming to fruition in the mid-thirties and the onset of Nazism, as Popper joins the endless list of refugees from one of the most creative cultural generational series of modern times. In fact the portraits of many of the figures of this time, with many of whom Popper interacted, makes up a striking portrait of cultural history. One is oddly reminded of the inverted resemblance to George Lukacs, another scion of this era, whose different response and fate to one and the same chaotification and reification of theory in practice echoes as a mirror image the swiftly conservatized The Poverty of Historicism, beside the equally classic The Open Society and its Enemies. The brilliant tactics of these works should make the history told by Hacohen of interest to any leftist, for the lines of counterargument stand clear, if only the point Popper made is understood. And, indeed, this greater context shows perhaps the limitations of these works. The critique of historicism is really about what Popper called the Oedipus effect, the interaction of theory and practice, and the outcome of the 'future of theory'. That future was the present, and had no theory, save that in the minds of those embarking on disorderly realizations, and this was the present of the Young Popper, a living figure indeed before the older conservative we know. Popper's courage in attacking Plato was so peculiar to some, that we forget that it attempted a virtual course in universal history itself, in that the birth of philosophy has always been haunted by the Platonic rejection of democracy. And therein lies a flaw in Popper's thinking,perhaps, if we can find a universal history that is not an historicism. We can, but that is another book. Fascinating work, and for many reasons, not least the curious history of logical positivism, and the suggestion of the unseen Kantian strain in Popper's thinking, often not evident in the surface accounts. Recommended.