Lord of the Flies by William Golding
A group of British schoolboys are marooned on a desert island. They were being evacuated for safety during a war. Finding themselves alone without adult supervision, they begin to form their own society. And their society soon begins to break down.
This is a new entry on my list of favorites. An amazing book. Golding uses children to explore the darkness in human nature. And the horror of it is, it feels like a logical natural progression from the order and co-operation of the early days to the fear and savagery that builds as time goes by and personalities assert themselves.