See esp. Introduction and Conclusion. Intermediate chapters profile Plato, Aquinas, Descartes, Moore. This was written when analytical philosophy reigned unchallenged. The Introduction provides some useful information on historical approaches. Levi mentions Lukàcs, but the book falls below the theoretical standard of good Marxism, though there is much that is usable in it. Alvin Gouldner's analysis of Plato is the most compelling.