1934. Lida Sokolskaya, brilliantly fluent in several foreign languages, moves with her brother Alexei Sokolsky, an employee of the Academy of Sciences, a specialist in precious stones, from Leningrad to Moscow. At the time of moving, they find a precious old pendant in the things of the deceased father. Lida enters into a contract with the director of the department store Viktor Serebrov — he must, using his connections and opportunities, help her to understand the secret of the pendant, and she
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