Diamond Mountain

During the preparation for shooting a detective film in an ancient mansion in Crimea, a priceless necklace called "Diamond Mountain" has been found. A scatter of diamonds, pearls, and opals serves as bait for any criminal, and it becomes known that there is a person in the film crew hiding their identity... But who are they?.. Ivan Opalin, who got involved in this complicated case quite by chance, will have to work hard to untangle all the threads, as what is happening in reality is beyond even the most perplexing detective story.