Football referee Oleg Dubinin, who came to the match but never appeared on the field, disappears. The match inspector urgently has to release a substitute, but the other referee judges biased. It's good that Artyom, Mukhtar and Vadik turn out to be at the match, who begin an investigation in hot pursuit...

Sergei Pronko's corpse was found in the apartment. The apartment belongs to his grandmother, who recently died of a heart attack. Suspicion falls on Borisov, who took care of the old woman while the grandson was losing her money in the casino. A will for the apartment was also drawn up for Borisov. From their neighbor's stories, it turns out that before her death, the woman began to hear the voice of her deceased husband. Mukhtar finds a hidden tape recorder in the piano with a recording of a mysterious voice...