Driven by the will of his father, Admiral Vall'Iolet, his son, Captain Leth, goes in search of the Tollon colonial expedition and finds it on the verge of dying. The planet on which the colony settled turned out to be inhospitable, but Captain Leth manages to help it move to another planet - Virta. Trying to improve the life of the colony on Virta, Leth, with a delegation of Tollons, goes on a friendly visit to the Gith civilization. But the Gitt civilization is going through its hard times: cosmic expansion is being replaced by cosmic nihilism. Trying to understand the contradictions of civilizations, Captain Leth encounters the minds of another dimension, the minds of the inner world. But even in the multidimensional world, not everything is clear.