What is it about?

«A world in which once dead people change society based on their personal beliefs is developing as rapidly as it is degrading. Several epochs, replacing each other, inevitably lead to the appearance on the pages of history of both heyday periods and periods of indescribable horror, which ordinary people have to cope with.
The main character will have to find out how the history of his world began, what role he will have to play in it and what someone's experiment, set out of curiosity, but stretching over several thousand years, will lead to.»