The Khazar Kaganate was the largest and strongest state in Eastern Europe in the 7th-10th centuries. Since the middle of the 9th century, Kievan Rus was a tributary of the Kaganate. His possessions extended from the Dnieper and Vyatka to the Southern Caspian Sea, the rulers of Khazaria competed in their power with the Byzantine basileus. What kind of state was this? How and who managed to defeat him? The famous writer Mikhail Kazovsky presents his version of those distant events in the form of a fascinating adventure novel. The plot of the novel centers on the fate of the wife of King Joseph, the fictional Irma-Irina, an Alan by birth, expelled by her husband from Itil, sold to Byzantium as a slave, and then participating in Svyatoslav’s campaign and the defeat of the capital of Khazaria - Sarkel.