Vladimir Cheyanov (played by Dmitry Miller), a brilliant detective with a sharp "calling" for justice, and Elena Kozlova (played by Olga Verman), his observant apprentice.
The plot is inspired by the real-life case of a Soviet counterfeiter and a brutal family murder that shocked the USSR.
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Cheyanov and his trainee, Elena Kozlova, follow the trail of the mysterious "bonus" money. They begin to uncover a web of illegal financial schemes involving "tsekhoviks" (underground Soviet manufacturers). The focus shifts to identifying how a common worker could have been involved in such a high-stakes criminal enterprise.