On more than 2000 pages there was a place for everything - the Kirillovsky heights with their little-known caves - including the Zmievo Lair, legends that Kyiv was Troy, and Kiy was a companion of Hercules, a description of all the Kyiv Bald Mountains, the mysterious personality of Princess Olga, all the left-bank rivers of the past and present, the connection of the Kyiv caves with other cities, mounds of Voskresenka and Kirillovsky heights. There is a connection between the Slavs, Scythians and Alans, bridges are thrown to the time preceding the Flood, the historical toponymy of Kyiv, reflected in chronicles and other sources, is analyzed in detail. Under modern landfills, long-standing tracts and burial lands appear. Myths are debunked about the authenticity of the "Words about Igor's Regiment" and that ancient Kyiv was a small patch on Starokievskaya Hill. Where to find iron ore in the vicinity of the city? How tall were the inhabitants of the ancient Kyiv caves? "Heresy" poses these questions and tries to answer them.