A series of monstrous catastrophes stopped the settlement of mankind along the galactic sleeve. Whole worlds died out, unable to withstand the struggle with other people's ecosystems, tens of millions of people died. The Federation fleet, in fruitless attempts to save the dying colonies, has exhausted its capabilities. It seemed that the expansion of Humanity was stopped. But a new force has emerged on the battlefield. Evoleks are girls and young men who are able to model with their consciousness in the ethereal worlds of living beings, ideally adapted to life on new planets. Young brave men turned the tide, and people again rushed to the stars. Many years passed, and dozens of new colonies, whose well-being was bought by the lives of children, stood on their feet. Life was surrendered for Life, and the Evoleks stubbornly sought a panacea for trouble - the destruction of their own consciousness when immersed in the Ethereal world of the Great River. But, when the light of hope appeared on the horizon...