Beetle in an anthill. Strugatsky A.N.

After the mission of Maxim Kammerer on the planet Saraksh, 20 years have passed. Now he works on Earth, in the commander-2. His next task is to find the progressor of Leo Abalkin, who arbitrarily left Saraksh, but ignored the demand to register on the ground. Cammer's meetings with friends of Abalkin reveal a secret that can cause serious harm not only to the people around him, but, possibly, to all of humanity...