The TV series "Mosgaz. The Executioner" is a continuation of the detective story about the brave Major Cherkasov and his investigative department. The events take place in Moscow in 1965. Ivan Petrovich is assigned a new and extremely important case - to identify and bring to justice a woman who worked for the Germans during the Great Patriotic War and executed her fellow countrymen. The difficulty lies in the fact that none of the surviving victims have seen her face: The Executioner wore a bunny mask before the execution.