Irina and Boris Godunov were left orphans early, and it is unknown what would have awaited them ahead if they had not run away from home to their uncle, who served as bed servants at the Tsar's court. Here little Irina met her peer Fedor, with whom she immediately became friends. Boris had a chance to meet the daughter of Malyuta Skuratov, the beautiful Maria... But not everything turns out the way the young people would like. Ivan the Terrible strictly forbade his youngest son Fyodor to marry a thin girl, and the feelings of Boris and Maria must be tested for a period of three years... So what will the friendship of the children lead to and what will the oath of youth lead to?..