Studying her pedigree, Masha became interested in the fate of her great-great-grandmother Ariadna Borislavskaya. Ariadna worked at the famous Alexander Bogdanov Blood Institute, was a prominent scientist, but at the end of the twenties she disappeared, and Masha could not find information about her in any archive. An incident brought her together with Vasily and Anna from the Clio Historical Consulting Center, and they set out to find out what really happened to Ariadne. In search of information about her, young historians came to sensational discoveries: Borislavskaya was familiar with Nikolai Gumilyov and, fulfilling the poet’s last wish, went to Africa to find an artifact that could change the course of history...