After 700 years, the descendants of those who once went on four colonial ships to explore suitable planets of distant space return to Earth on a scientific expedition. Unknown radiation did not allow the colonists to maintain contact with their native planet, and multiple problems with the colonization of new planets and then the policy of gradually growing worlds did not previously give reasons to connect the old and new worlds of mankind. However, there was no one to meet the expedition: on the home planet, the prodigal children of the Earth were met only by ruins and silence. All possible scanners reported the absence of any fauna. At the same time, the flora developed violently and gradually absorbed the dead kingdom of people.