About the book: year / The patrol ship "Brave" arrived in sector 2-5 of the Galaxy, where prospectors must explore the rocky planet Er-3-bi. On instructions from the center, they are looking for an exotic substance suitable for space torpedoes. The planet is sterile, there are not even microbes on it. After work, they are obliged to leave the planet in the same sterile state. But it's not that simple...