Wow! I didn't expect this when I started reading. What a well told story.
There are opposites throughout: idyllic island surrounding/Victorian London; peaceful island/rebels & militia; Great Expectations/no expectations. The juxtapositions are harsh and affective.
Mr. Watts, the only white man on the island, takes it upon himself to teach the children during times of war after the school has been closed. He uses Great Expectations as a textbook, teaching the children of a world beyond their own, asking them to open their imaginations. The parallels & similarities between the two worlds are wonderfully interwoven as the story reveals itself.