The Marquesas are great masses of basalt that rise hundreds of metres above the surface of the sea In the summer of 1888, the Scottish novelist and travel writer Robert Louis Stevenson embarked on a valedictory tour of the South Pacific. His health, never good, was in decline, and he believed, as he later recalled, that he “was come to the afterpiece of life, and had only the nurse and the undertaker to expect”. He was not far wrong: he lived only another six years.
His breakthrough novel, The Strange Case of Dr Jekyll and Mr Hyde (1886), had proved a literary sensation, bringing him both fame and fortune. Thanks to that success, in San Francisco he was able to charter a luxurious 94-foot schooner called the Casco, on which…