Autumn 1904. Fleet armaments in England and Germany cast the shadow of the First World War. What are the two young Englishmen Davies and Carruthers looking for in the North Sea at that time? ARD presents ten exciting episodes of an adventure series based on Childer's classic espionage thriller, one of the most famous sailing and sea novels in the world. At the same time, the story of a friendship between two dissimilar men, the fur seal and the dandy. In the confines of their yacht 'Dulcibella' and under the pressure of constant mortal danger, they pull themselves together; together they finally manage to solve the riddle of the sandbar ...