Agent D, a revolutionary who has broken with the Communist Party and expects retribution at any moment, flees through the streets of prewar Paris, haunted by the ghosts of his past and his fears for the future. Part two finds D's friend, and fellow revolutionary, Daria caught up in the defense of a besieged Leningrad. The third part is set in Germany; on a dangerous assignment behind the lines, Daria finds herself in a city destroyed by both Allied bombing and Nazism. The novel closes in Mexico, where D and Daria are reunited.
The men of Earth were on the verge of breaking into space. The first of their manned moon rockets was on its way to Luna. Now, after ten thousand years, the celestial Watchers were forced to a decision. Were the Earth people ready to join in the civilizations of sapce - or should they be turned down and wiped out with solar fire? THE TRIAL OF TERRA had begun!