About 200 years ago, when Alexander Pushkin left Odessa, a supporter of his talent, the Duchess Elizabeth Vorontsov, presented a ring to the poet in memory. This gift became a talisman for him, and the secret mark on it was the source of many legends and literary studies. Today, a junior researcher at the Odessa Pushkin Museum, Natalya unexpectedly meets a young man whose relative knew the secret of the intricate and almost detective history of the Pushkin mascot. The descendant of the jeweler who made this mysterious sign on the ring revealed the veil of the 200-year-old mystery. Soon, Natalia, Paul and their driver Andrew set off on a fascinating expedition to the Crimea to find the answer and reveal the secret of the air city of the Crimean fortress Chufut-Calais ...