Karl Franz, prince of the kingdom of Karlsberg, has grown up sheltered and under tutors. Since childhood, he has been engaged to Princess Margaret. His grandfather, the king, sends him to improve his social skills as a regular student at the venerable University of Heidelberg. Karl and his entourage take up quarters at a local inn, and helped by new friends, Detlef, Lucas, and Von Asterberg, the prince soon starts enjoying student life. He also falls in love with Kathie, the innkeeper’s niece, and the couple considers eloping. But when Prince Karl learns that his grandfather is dying, he realizes that he must return to Karlsberg to become the new king, and to honor the arranged marriage which neither he nor the princess wants.