Elusive Isabel by Jacques Futrelle (1875 - 1912)

Elusive Isabel is a novel by Jacques Futrelle (April 9, 1875 - April 15, 1912) first published in 1909. Set in Washington, D.C., it is a spy novel about an international conspiracy of the "Latin" countries against the English-speaking world with the aim to take over world control (Summary from Wikipedia)