Light is life. Beyond the life-saving rays, the valley awaits only permanent frost and an inevitable death. For the last survivors, the giant sun in the zenith is the great god Люминар, demanding blind faith and unquestioning obedience to its priests.
Lисарий, nicknamed the Fox, once also prepared to carry the word of Люминар, but he paid for his inconvenient questions with his status. He is convinced: their sun is not a deity, but an ancient mechanism. And when the flawless machine in the heavens falters for the first time, Лис understands the terrible truth: the machine is breaking.
The community has no backup sun. To save his world from the looming disaster, Лис will have to go against the foundations of his home and unravel the mystery of the forgotten creators. But is he ready for what lies behind the light of Люминар?