Detective Drongo is approached by a representative of one of the most powerful political organizations in the world with a proposal for cooperation. He asks to conduct an internal party investigation and calculate the "mole" - an employee through whom top secret political information is leaked. Drongo readily gets down to business. During the investigation, information about the illegal activities of the organization accidentally falls into his hands. And the very next day the hunt begins for Drongo. The detective uses all his skill to get away from his pursuers, but at one fine moment luck turns away from him, and the killers manage to corner Drongo ...