One fact about this book should be established from the start - this is not a children's book. The 'littluns' and 'bigguns' represent members of the human race. The conflict between law and barbarism would have, I believe to be the same had the island been inhabited with adult survivors instead of children.
The novel is about a transition from an immensely exciting adventure of some children, to what eventually becomes full-scale war, ending with the arrival of the naval officer who rescued them. Tough I still wonder if they were really saved, considering the atomic war which, at that time was still raging around the globe.
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