This book was the first in the “Testament of the Prophet” series, which in turn is a development of the side storyline of the “My name is Zarathushtra” series. Our contemporary, who has found himself in the past and made a dizzying career there, decides to go back. But it turned out that his desperate dancing on butterflies changed everything too much. The future that he remembers no longer exists. There are no entire countries and peoples. Those who were colonialists and were part of the golden billion became suppliers of guest workers. Epidemics that devastated entire countries were stopped. And the world in which he found himself became not a direct descendant of the Greco-Roman civilization, which never arose here, but came out of the Assyro-Babylonian Empire, with its disregard for human life and the despotic nature of government. However, having found himself on the same day and place from where the GG went into the past, he saw that civilization had gone far ahead compared to the year 2021 of our reality. But how can we go back now?