People have long ago conquered the cosmos, but it does not seem that the cosmos itself considers itself conquered. He again and again appears before a man with a formidable and incomprehensible Sphinx, again and again puzzles and ferociously punishes for the wrong answer. Three planets visited by adventurer Yazon din . Alta, these are three mysteries of the cosmos, three deadly logical traps. On Pirra, everything turned against people - animals, plants, elements, and the death of the heroic colony - it's only a matter of time. On a planet of savages, one can become either a slave owner or a slave, a third is not given. And the nomads of the planet Happiness know no other purpose of existence than endless war.