The Riddle of the Sands

Set in 1903, "The Riddle of the Sands" follows Carruthers, a British Foreign Service officer, as he embarks on a sailing voyage around the Baltic with his friend Davies, who has a secret mission involving a German invasion plot. As they navigate unknown waters, they uncover dangerous secrets that could have serious implications. Recognized as the first modern espionage novel, it offers a thrilling glimpse into early intelligence work.