This time, the cheese placed by someone unknown in the mousetrap for humanity was especially attractive and seemed completely free. Live for hundreds of years, enjoy all the benefits of civilization. No violence, no crime... At first Artem Novikov was confused only by the absolute isolation of his hometown from the outside world and the complete lack of freedom of choice. But a visit to the cemetery, where instead of the grave of his parents there was a monument to some Mark Mammoth, made him think seriously about what was happening. What were the impenetrable domes that covered the cities of the Earth one after another? An attempt by aliens to save its inhabitants from nuclear carnage or something worse? And who is this mysterious ally helping Artyom in clashes with uninvited guests?