After the resignation, the captain of the border troops Sergey Bronnikov returns to his native Siberian city to his father, a retired geologist. On a hunt, his father claims that they are literally sitting on billions - his father found a rich gold mine. He spoke about the find to his former student, and now the official of the city administration, Vadim Mezentsev. Mezentsev, long associated with crime and having an illegal gold mine, decides to use the information personally for himself. Realizing this, Bronnikov Sr. refuses to tell where the gold mine is. Unable to withstand the torture, he dies of a heart attack. Now Mezentsev’s only hope of finding gold is that his father managed to tell his son about it. Suspecting something was wrong, Sergey writes a letter to his old friend Stanislav Sheremet, FSB lieutenant colonel.