In a news item last month Heisenberg is reported to have offered a solution to the so-called unified fields theory problem- that of creating a single equation to cover the behavior of all physical phenomena. Just as Heisenberg has devoted his declining years to this problem so did Einstein, for it is considered the greatest one in all of modern physics to crack. But the matter of the solution has always been a matter of prime dispute: Einstein rejecting the notion that chance, probability or indeterminacy could be a feature of the universe; Heisenberg clinging to the opposite view. The dispute goes beyond physics and embraces the fundamental truths of philosophy as they derive from modern science. The book here, stating from both a historical and logical standpoint the position of the author and his followers, is of acutest interest on at least three counts. The first, if the solution recently proposed is borne out experimentaly, the book will serve as the intellectual foundations for the achievement; it will, presumably, revolutionize the generally accepted tenets of Einsteinian scientific philosophy. Second, in itself and regardless of present or future solutions to the unified fields problem, the book is a beautiful exposition and summation of the philosophical and scientific differences which rage between contemporary physicists. Finally, the book touches upon the underlying human implications to society of the Heisenbergian concept. The introduction by Northrop is a model of directiveness for the uninitiate; it deserves something more than praise. A limited audience, willing to give their intense interest and attention, but for them, an enlightening and engrossing experience.