Crux : Centuries ago, the Time of Troubles left Earth shattered and nearly empty. But a few survivors in Central Asia and returnees from Luna Base hung on to bring the human race back to life. Now the Government of the Universe is spread out among hundreds of worlds. Genghis Khan is idolized as the Great Unifier of Humankind, and democracy is a long-forgotten notion. Old racial and religious divisions have been swept away by the rising oceans that lap around the Appalachian Islands, and peace abounds throughout the stars. Into this glorious golden age comes a new threat. Scientists in the Worldcity of Ulanor have created a wormhole generator - a machine that can send people into the past. A band of Old Believers, bleeding hearts, and other malcontents who call themselves "the Crux" have captured the generator to undertake the greatest humanitarian mission of all time: stopping the Time of Troubles by assassinating the man responsible, the legendary Minister Destruction. Of course, Crux has to be stopped. Even the smallest change to the past will destroy the future - and the Earth Controller won't stand for that. The agents of the Office for the Exploration of the Past - Pastplor - work to thwart Crux and other sociopaths, criminals, and do-gooders who would jeopardize the fragile peace so hard won. Their missions spanning a wide array of vividly imagined futures, Pastplor's agents protect the past from those who would dare to meddle. The time-travelers are hailed as saviors of humanity - but cannot escape the feeling that they're on the wrong side of the war.