Epistolary, confessional, and didactic in form, the book is presented as an autobiography of the title character (whose birth name is Robinson Kreutznaer)-a castaway who spends twenty-eight years on a remote tropical desert island near Trinidad, encountering cannibals, captives, and mutineers, before ultimately being rescued. The story has since been thought to be based on the life of Alexander Selkirk, a Scottish castaway who lived for four years on a Pacific island called "M s a Tierra", now part of Chile, which was renamed Robinson Crusoe Island in 1966, but various literary sources have also been suggested.