A WORD about the origin and authorship of this book.
  In October last (1902), my friend 'Carruthers' visited me in my chambers, and, under a provisional pledge of secrecy, told me frankly the whole of the adventure described in these pages. Till then I had only known as much as the rest of his friends, namely, that he had recently undergone experiences during a yachting cruise with a certain Mr 'Davies' which had left a deep mark on his character and habits...