Castaway is a 1986 film starring Amanda Donohoe and Oliver Reed, and directed by Nicolas Roeg. It was adapted from the 1984 book of the same name by Lucy Irvine, telling of her experiences of staying for a year with writer Gerald Kingsland on the isolated island of Tuin, between New Guinea and Australia.

In 1981, Irvine responded to a "Writer seeks 'wife' for year on tropical island" advertisement placed by Kingsland in the London magazine Time Out. Chosen by Kingsland from over fifty applicants, Irvine agreed to marry him in order to satisfy Australian immigration restrictions before they travelled to Tuin. She was twenty-five and Kingsland forty-nine.

After a year on the island she returned to England and wrote her memoirs.