Riddle of the Sands, The Bog Oxford Bookworms 5 1800 headwords B2
When Carruthers joins his friend Arthur Davies on his yacht Dulcibella, he is expecting a pleasant sailing holiday in the Baltic Sea. But the holiday turns into an adventure of a different kind. He and Davies soon find themselves sailing in the stormy waters of the North Sea, exploring the channels and hidden sandbanks around the German Frisian Islands, and looking for a secret - a secret that could mean great danger for England.
Oxford University Press