The inhabitants of the artificial planetoid Graviton-4 have not only eternally young bodies, but also the curiosity characteristic of the young. Risk does not frighten them, their favorite pastime is searching for monsters, and their natural desire is to unravel the mystery of Kronos, a black hole, near which they are able to attract the attention of an alien civilization for the first time. Those Who are Older than Us are far ahead of earthlings, but does this mean that nothing threatens people? Intensely studying the black hole, the crew of Graviton-4 is exposed to Kronos, and this changes everything and everyone... Here is a new book by the author, who was recognized and remembered already from his debut novel “Epsilon Eridani”. A book that continues the best traditions of classic Russian science fiction. Science fiction that we all grew up with.