Welcome to the 23rd century! In an era when humanity has finally “settled” in the solar system. To the Jovian moon Callisto, where cosmoarchaeologists found a device buried under thousands of years of layers of ice? Or is it a BEING? Something that was brought to Earth. Something that one day... turned on? Or did it come to life? And then the giant comet, flying towards Jupiter, suddenly changed its trajectory - and rushed towards the Earth... What is this - an absurd coincidence? Unknown cosmic factor? Or is it irrefutable proof of the existence of intelligent life on Jupiter? And now the Earth’s space fleet is heading to Jupiter...