Everything in the Universe is interconnected, and 156 planets scattered across its different corners, the inhabitants of most of which do not even suspect the existence of their neighbors, are connected by an invisible thread into the Ring of Worlds. Any incident in one of the worlds of the Ring gives rise to an event wave, which, moving from world to world, gains strength and gradually turns into a natural disaster that sweeps away everything in its path, capable of causing a universal cataclysm. To prevent this from happening, the mysterious guardians created a Center in time immemorial, whose task is to localize event waves and prevent the Universe from perishing. Grais, a messenger from the Center on the backward planet Tessa-3, has already once saved the Universe from the danger that threatens it. He left the planet, remaining in the memory of its inhabitants as a great prophet. But after a decade and a half he had to return...