The film opens at
Potsdam in the time of "The Soldier King"
Friedrich Wilhelm I of Prussia, with the royal family sitting at the breakfast table. It turns out that Crown Prince Friedrich, informally called "Fritz", lost so much money at the gaming tables that he had to sign
IOUs. Moreover, members of the
grenadier regiment saw the Crown Prince appearing late for roll call in a dishevelled state, which greatly angers his father. The King wants to prepare his son for his future role as a ruler, and regards his preoccupation with music and literature with much displeasure. Exasperated with his father's strictness, Fritz hatches a plan to flee Prussia and get to
France and
England, where he expects to be welcomed by his mother's family. He asks his companion
Katte to help him in this plan. However, being a
second lieutenant bound by his officer's code, Katte at first declines. The father-son conflict further escalates when Fritz reveals even heavier gambling debts than those the King already paid off. The King insults the Crown Prince, calling him "a liar and a coward" and has him put under arrest. In the barracks, he is forbidden to engage in his beloved flute playing or to read French literature. At night the King returns earlier than usual and surprises the Crown Prince playing the flute in the music room together with his sister
Wilhelmine. Katte, who is also present, manages to hide just in time. The angry King throws Fritz's books and flute into the open fire and orders the Crown Prince to accompany him on a trip to Southern Germany. Fritz, more than ever determined to go ahead with his escape plan, can count on Katte's support after this incident. However, the escape fails, and both the Crown Prince and Second Lieutenant Katte are condemned by a
court martial to custody at the fortress of
Küstrin. However, the irate King arbitrarily amends the judgement against Katte to
capital punishment and insists on having him actually executed. The Crown Prince submits to the King's authority and is moved to better quarters in a palace. Nevertheless, in a visit by the King it is evident that the relationship between father and son is still very chilly and they are estranged. Fritz, who in the meantime has proved his "character," is now given his own household at
Rheinsberg Castle where he can again follow his artistic inclinations. Reconciliation between the estranged father and son does come about shortly before the death of the King. The last words of the Old King to the Young are: "Make Prussia great!" (The audience, aware of basic elements of German history included in their school curriculum, know that Friedrich would duly proceed to do just that.) ==Cast==