Sherlock Holmes: His Last Bow. (Audiobook) 

On the eve of the First World War, the German agent Von Bork is getting ready to leave England with his vast collection of intelligence, gathered over a four-year period. His wife and household have already left Harwich for Flushing in the Netherlands, leaving only him and his elderly English housekeeper.[1] Von Bork's associate, Baron von Herling, a German diplomat from the Embassy of Germany, is impressed by his acquisition of vital British military secrets, and tells Von Bork that he will be received in Berlin as a hero. Von Bork says that he is waiting for one last transaction with his Irish-American informant, Altamont, who will arrive shortly with a rich treasure: naval signals.