Karl Heinrich is the heir to the throne of the small European principality of Rutania, but he's a lonely child, not allowed to play with other children and knowing little about life outside the castle. When he reaches maturity, he is sent to attend the University of Heidelberg, and finds fellowshi with classmates and a blossoming love with Katie Ruder, his only friend during childhood and the niece of an innkeeper. However, political turmoil in Rutania forces him to return. War is declared. Heinrich returns to Heidelberg one last time to bid a somber farewell to his beloved Katie.
Wallace Reid
as Prince Karl Heinrich
Dorothy Gish
as Katie Ruder
Karl Formes
as Dr. Juttner
Erich von Stroheim
as Lutz
Raymond Wells
as Karl Bilz
John McDermott
as Von Wendell
James Gibson
as Kellerman
Franklin Arbuckle
as Fritz Ruder - Katie's Father
Madge Hunt
as Frau Hans Ruder - Katie's Aunt
Erich von Ritzau
as Prince Rudolf (as Erik von Ritzau)
Kate Toncray
as Frau Fritz Ruder - Katie's Mother
Harold Goodwin
as Prince Karl - Age 12
