Black Diamond of Sonya Golden Hand

The black diamond "Noir De La Roche" — "The Black Cliff" — was stolen from a prince who arrived in Moscow from Central Africa in the 19th century. The precious stone was stolen by his servant-translator, with whom the nobleman traveled through Russia. The fraudster was not brought to justice in time, but his dead body was found. The diamond disappeared without a trace, but soon came into the possession of the famous thief Sonya Golden Hand… Investigator Sergey Dulo arrived at a restaurant to meet with the renowned lawyer Susanna Milkina, but suddenly an explosion erupted in the luxurious hall… Milkina perished, and Sergey miraculously survived and took an active part in the investigation of the explosion. Unseemly episodes from Susanna's past surfaced, one of which involved the murder of a famous actress, a star of Soviet cinema, and the theft of her priceless black diamond…