What does the exchange that follows reveal about each character?
"'I mean it,' whispered Piggy. 'If we don't get home soon we'll be barmy.'...
'You write a letter to your auntie.'
Piggy considered this solemnly.
'I don't know where she is now. And I haven't got an envelope and a stamp. An - there isn't a mailbox. Or a postman.'"