When the era of the conquest of the stars was just beginning, Abigail Gentian divided herself into a thousand male and female clones and called them tents. In six million years, the tents have acquired the highest technology, the fastest ships, the most powerful weapons. With the help of relativistic velocities and cryosus, these people learned to manipulate time, and compared with the rest of humanity, they are now immortal - they are compared with worms that crawled through the pages of history. For young civilizations, they are like gods - they can save a star from an explosion, move a planet, revive the economy of the whole world. But recently in the Universe there was a certain force seeking to destroy the progeny of Gentians. In order to fight this ruthless enemy, the Shutterers must first solve his mystery.