Azerbaijani security officials detected a spy radio, which transmitted an encrypted message: "Send emergency medicine. Nymph." At the same time, the apartment of scientist-chemist Sardar Azimov (Hasan Mamedov) was broken into. In fact, the thieves were not interested in valuables, but in information from a "numbered" directory that Azimov had taken home without permission from the institute's management. Soon one of the thieves, disabled Khudoyar, was killed by someone ...