About the book: 2020 / The wealth of the representatives of the Yusupov family amazed the imagination of even members of the imperial family. However, having emigrated from revolutionary Russia, the most famous of the Yusupovs, Felix Feliksovich, was able to take abroad only a small share of the jewelry and art objects that his family owned. The main part of the countless treasures was reliably hidden... Nowadays, part of an encrypted note addressed by Prince Yusupov to an unknown person, which refers to some valuable thing, falls into the hands of St. Petersburg housewife Nadezhda Lebedeva. A lover of various kinds of riddles, Nadezhda Nikolaevna considered it a matter of honor restore the missing part of the mysterious note and, perhaps, find the hiding place of the Yusupov princes.