Mysterious Mr. Sabin - Edward Phillips Oppenheim

French royalist Mr. Sabin is working to acquire valuable papers regarding English coastal defences for the German government. In return, he demands German conquest of France and the restoration of the French monarchy to Prince Henri and Mr. Sabin’s own cousin, Helene of Bourbon. An international plot of intrigue, cunning, spies and subterfuge – in this thrilling tale from author E. Phillips Oppenheim.