The adventure spy novel “The Error of the Resident” consists of two books: “The Error of the Resident” and “The Return of the Resident.” In the first novel, it tells about a complex operation developed by Soviet intelligence agents. The result of the operation was the exposure of a network of foreign intelligence agents. The events take place on the territory of our country and in a number of foreign states. The reader will also learn about the activities of the spy Mikhail Tulyov, sent into the Soviet Union. The second book introduces the reader to the further activities of Mikhail Tulyov, who is now working for Soviet counterintelligence.