What does Mafatu see that gives him hope? Describe Mafatu's homecoming. Is it what he had hoped for?
I assume that you are talking about the end of the book since your second question is about the end. If that is the case, what Mafatu sees that gives him hope is the "lagoon fire." This is the reflection of the lagoon of his atoll on the sky.
Mafatu's homecoming is everything he could have hoped for. His father is practically unable to believe that it is his son standing before him. His face is "transformed by joy." He says that Mafatu's name is appropriate because Mafatu is a brave boy.
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