There is a 3rd ending? I'll have to look for itThere are three different ones as I recall. And how could they make a sequel - the main character has moved into legend? The book is excellent, for those who have not read it (and it's a very short read, good for a camp).
And they could make a sequel follow on from where the kid and the woman make it to the safe area and make some drama or show them starting to cure the world
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