The time is 1903. Carruthers, on leave from Britain's Foreign Service, accepts an invitation from his friend, Davis, to sail around the Baltic. But Davies has a secret mission. He has run foul of a secret German invasion plot and persuades Carruthers to push into unknown waters with him to find out what it is the Germans are hiding before it is too late. The Riddle of the Sands is considered the first modern espionage story. It is the only novel written by Erskine Childers, an Intelligence Officer for the Royal Navy during World War I, a decorated soldier, and a suspected double agent and mastermind of the rebellion against the young Irish Free State.