Elusive Isabel by Jacques Futrelle

A spy classic of epic proportions by Jacques Futrelle, author of The Thinking Machine
Isabel Thorne-half Italian, half British-is a formidable international spy. Employed by the Italian secret service, her mission is to ensure the signing of a secret contract allying Latin countries against England and the United States. The pact is to be sealed right under the noses of "the enemy" in Washington, DC. Meanwhile, Isabel's brother has invented a means of deploying underwater missiles in the hopes of securing worldwide military dominance. The entire globe is suddenly in danger, and Isabel Thorne finds herself right in the thick of the conflict in this thrilling spy mystery that has endured for generations.
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