The interplanetary itinerary of Crag (a rogue, in the biological sense, an ""accidental variation"") takes him on a mission to Mars to steal a disintegrator which can destroy all worlds- and he is forced to kill the megalomaniac behind the scheme. Attempting to find- but failing- an anodyne for the depraved corruption around him, he finally escapes to the raw, new planet Cragon which will offer a better life.... Ideas as well as activities create their ferment here- and it seethes.