The story of "The Royal Box" chiefly concerns a favorite actor of a century ago in England. James Clarence, the boon-comrade of the Prince of Wales, and one who occupied a peculiar, popular position with the play-goers of that day. The scene opens with the actors presentation at the Swedish Embassy Ball, by the Princc of Wales. There he meets Lady Felsen, the wife of Count Felsen, and she is at once charmed by his elegant manner. He apparently reciprocates her admiration and the warmth of their first meeting, inspires her noble husband to be very distant and disagreeable. The second party to the plot is Lord Hasset, a petulant old roue, who urges marriage upon his beautiful ward, Celia Pryse, and singularly enough, she comes in to innocently share the big responsibilities that make and mar the close of Clarence's career as a favorite in England.