The demoted staff captain Anatoly Chvanov - the criminals call him Tolik the Daring - on the way to hard labor, he found out that his father had hidden one hundred thousand rubles before his death, encrypting their location in two medallions. One of them is on Darzky’s neck, the second is in St. Petersburg, with his brother the moneylender. Having escaped from hard labor, Anatoly Chvanov came to his brother. He tried to detain him, but the criminal mortally wounded the moneylender. The accidental witnesses to the murder were the inhabitants of the St. Petersburg “bottom” - the hooker Froska and her son Keshka. Detective police arrested Froska, accusing her of murder. Trying to save his mother, Keshka makes acquaintance with the son of a famous lawyer, high school student Volodya Tarusov and his classmate Fedya Lipov...