In the USSR, a wonderful dental apparatus was created. This is learned by the chief of one foreign intelligence, Stampf, who suffers with toothache. He is developing a plan for the kidnapping of this invention, summons his best agent and entrusts him with this most important task. In the Soviet Union, the insidious plans of hostile intelligence are recognized even before they are realized. To fulfill the task of neutralizing spies, General Sidortsev summons Colonel Sidorov, who connects Captain Sidorin and Lieutenant Sidorkin to the case.