Carlos Lopez is a handsome Argentine sportsman. Many women love him and he toys with them all. His days are filled with romance and intrigue and he manages to get himself feared and hated by most of the married men in Buenos Aires.
In San Francisco, Sylvia Douglas and her fiancée, James Callahan, a reformed crook, make their getaway after Jim, disgusted with his inability to find a job, un-reforms and steals a diamond necklace. Graham, a detective, gives chase to a desolate island in the South Pacific where a rum-running gangster, Murdock, holds him captive. Callahan becomes infatuated with a native girl, Leona, and Sylvia turns to Graham for protection against the offensive Murdock. A volcano eruption causes problems for all.
A Man Four-Square is a screen version of William McLeod Raine's popular tale of a rancher who finds himself falsely accused of murder while attempting to help a friend in need.
Behind the doors of a foreign government's embassy in Washington D. C., a group of royal loyalists is attempting to raise funds to aid a counter-revolution and restore the deposed emperor in a new republic. They are led by an unknown leader called 'The Eagle."