The first part of the "Hussite Revolutionary Trilogy", completed with Jan Žižka (1955) and Proti všem (Against All Odds, 1957). The film captures the period from May 1412 to the summer of 1415, a turbulent time in the Czech Kingdom, during which there were protests in Prague against the sale of "omnipotent indulgences" whose sale throughout the kingdom was announced by Pope John XXIII. The ideological leader of this movement is the preacher Master Jan Hus, whose words, calling for the elimination of church abuses, are listened to in the Bethlehem Chapel by thousands of ordinary Praguers, Czech lords and Queen Sophie, wife of the Czech King Wenceslas IV.