Tommy Dodds is an accident-prone stage manager who overnight becomes the King of Betonia. However, his uncouth Australian larrikin attitude, which sees him gambling with the footmen and decreeing that his courtiers wear roller skates, scandalises the court. When the rightful heir to the throne is discovered, Tommy is forcibly removed from the palace, at which point he wakes up from what has all been a dream.
The film is based on Wallace's revuscial of the same name, His Royal Highness. Thring and screenwriter C.J. Dennis made only minor changes to the original stage version. One of these alterations sees Dodds, a down-and-out, accident-prone pie vendor in the stage version, become a stage manager in the film. Under Thring's direction, too, little was done to modify Wallace's stage routines for the camera, with even his make-up retaining its heavy theatrical look.