The adventures of the former detective police official Tarakanov begin when Osip Grigorievich, after the revolution, is mobilized against his will into the Soviet criminal investigation police and assigned to investigate his first crime: robbery with murder. Will the new government appreciate Tarakanov’s professionalism? Or will he consider him insufficiently competent, or even dangerous? Osip Grigoryevich has difficulty finding the perpetrators of the crime, but will they let him get close to the customer?..