John Buchan 
The Courts of the Morning [EPUB ebook] 

This 1929 adventure novel by John Buchan features his popular character Sandy Arbuthnot. The story is set in the fictional South American country of Olifa. When Arbuthnot and his friend John Blenkiron learn that an industrial tycoon plans to rule the world from his Olifan base, Arbuthnot leads a revolution to stop the tycoon’s plot and allow the Olifan people to control their own destiny. This thrilling tale evokes the exotic location of 1920s South America and Buchan’s talent for adventure writing.