Zhuk v muraveinike - Strugatskie Arkadii i Boris

After the mission of Maxim Kammerer on the planet Saraksh passed 20 years. Now he works on Earth, in COMCON-2. His next task - to find the progressor Leo Abalkin, who voluntarily left Saraksh, but ignored the requirement to register on Earth. Kammerer's meetings with Abalkin's acquaintances reveal a secret that can cause serious harm not only to the people around him, but also, perhaps, to the whole of humanity...