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Retired police captain Klym Zhehrai is wanted by Hetman Skoropadskyi's intelligence chief to deliver an assignment. Zhehrai has to find the killer of the sexton Hnat Berezovets, expose the criminals who are looking for jewels in the house of Countess Maria Branytska, and find out who is hiding behind the mysterious terrorist organisation Tribunal of the Apostles. The investigator arrives in the White Church undercover as an insurance agent. Unexpectedly, he is invited to a closed meeting of the men's club History and Rank. And they offer to steal a precious brooch from the Branicki estate - the « Purple Rose of the Nile», once made especially for Napoleon. So, the bait worked. Of course, stealing was not part of Zhegray's plans, but the club's representatives are good at persuasion...