On one of the facets of the Great Crystal spins the Gyroscope Wheel—the stabilizer that supports the smooth expansion of the Institute Courtyards’ space, where evil, violence, and other vile things cannot penetrate. An attempt to influence the Gyroscope in order to sharply increase the territory of the “space of good” ends in failure… And then the heroes of the novel “The Trot of Chess Horses” have only one thing left to do: do everything possible to ensure that this wheel never stops.