About how Soviet border guards managed to detect and neutralize foreign intelligence agents.

Soviet intelligence spouses — Lyudmila ("Lyre") and Fyodor ("Starling") Grekov at the beginning of the Great Patriotic War are tasked with settling in Germany. Personnel intelligence officers with vast experience are successfully introduced into German society and begin to work actively. At the end of the war, during the bombing of Berlin, fate separates them, but then they will meet in the new Germany and continue their work.

The chekist Andrei Kedrin had documents in his hands indicating that the British were preparing an invasion of Soviet Turkestan. A small group of Chekists is sent to the Pamirs, led by Kudrin, to intercept an English caravan with weapons. Kedrin knows the area well, has lived in Khojent for several years, and is familiar with local customs.