Imagine an ordinary Central Russian town, a Soviet regional center from 1967, inexplicably transported by unknown experimenters to God knows where... not even to another planet, but to the inner surface of a huge artificial formation - a Dyson sphere - where millions of worlds can coexist... Difficult tests with during the first days they are issued to the residents of the city. The hardships of the war for existence against a hostile and completely alien environment will be aggravated by the sluggish and clueless leadership of the regional center; so the whole burden of the struggle and the search for the right solutions falls on the shoulders of individuals, yesterday’s boys...