H. De Vere Stacpoole 
Blue Lagoon, A Romance [EPUB ebook] 

The Blue Lagoon is the story of two cousins, Dicky and Emmeline Lestrange, stranded on a remote island with a beautiful lagoon. As children, they are cared for by Paddy Button, a portly sailor who drinks himself to death after only two and a half years in paradise. Frightened and confused by the man’s gruesome corpse, the children flee to another part of Palm Tree Island. Over a period of five years, they grow up and eventually fall in love. (Amazon)