After World War III has ravaged the globe and toppled once-great nations, a new science offers hope for the future:Psychodynamics, the ability to influence government and popular opinion. Led by the Psychotechnic Institute,humanity denounces its violent ways, once and for all. Peace reigns on Earth. Humankind shakes off the tyranny of gravity and ventures out into the galaxy. But no sooner is utopia realized than the cycle of war and destruction begins anew.The final of three volumes collecting all of multiple Hugo- and Nebula-Award winning author Poul Anderson'smassive future history magnum opus. Includes short stories previously uncollected in a Psychotechnic League volume!