The story of St. Eustathius of Mtskheta unfolds during the reign of King Huasro, highlighting his journey from a Persian healer to a devoted Christian. After embracing Christianity and receiving baptism, Eustathius faces hostility from local magi and is summoned by Ustam, the fortress head, for trial. Despite threats of suffering and death, he remains steadfast in his faith. The narrative culminates in the capture of Eustathius and seven other Christian youths, who share their conversion stories, emphasizing the allure and virtue of Christian youth over paganism.