In this lavish sequel to The Three Musketeers, dashing D'Artagnan (Douglas Fairbanks) reunites comrades Athos (Leon Bary), Porthos (Tiny Sandford) and Aramis (Gino Corrado) to undertake the rescue of Louis XIV (William Bakewell), rightful king of France, who is locked away and forced to wear an iron mask. The musketeers must thwart the murderous machinations of Count De Rochefort (Ullrich Haupt) in Douglas Fairbanks's silent-film swan song.