When their plane crashes, the boys who were on board find themselves on a strange island where they have never been before. Needless to say, this is a new situation for them. They're stoked to be the boss of themselves, but not so stoked to be stuck here forever.
The boys are having a great time running around naked and establishing a system of rules and order and that's going to last about five minutes before the spears and body paints come out.
Ralph realizes that governing a group of wild boys is about as much fun as it sounds, and he goes head-to-head with Jack over such important issues as "fire" vs. "pig." On top of it all, he has to deal with everyone's irrational fears. It's lonely at the top—especially when no one will listen to reason.
And we've moved steadily to murder and chaos. Simon and Piggy are killed, the island is blazing, and Ralph is on the verge of being killed himself. Pretty nightmarish.
At the last minute, Ralph rolls onto the beach and looks up to see a Naval officer standing over him. This would be a thrilling escape if it weren't for the fact that the boys are going back to a world as bad as the one they're leaving.