The action of the series "Isaev" takes place in Russia in the 1920s. The story revolves around a young Soviet intelligence officer named Vasily Isaev, better known to the world as Shtirlitz, who embarks on his first mission in life. He is tasked with traveling to the Far Eastern Republic to infiltrate the ranks of the White Guard emigrants who fled the country after the revolution. Along the way, Vasily is forced to find the thief who stole gold and precious treasures from the state vault before they are sold abroad.