Witness to the birth of the Universe, a cosmic exotic, a giant superstring, the gravity of which is many times greater than the gravitational field of such monsters as Jupiter, is approaching the solar system, attracting and breaking into pieces planets, asteroids and... spaceships encountered along the way. A similar object, only much smaller, already flew into the human habitation zone half a century ago, and the Earth avoided disaster. What was it then? Test shot? Durability test? And now? Did someone decide to ensure that the space of future expansion is cleared, or is this a tragic coincidence, of which there are countless numbers in space? These questions will have to be answered by Major Denis Molodtsov, the commander of the string expedition, who is ready to look for unexpected solutions in unusual situations. Ready not to feel sorry for oneself for the sake of people. Ready for anything...