Boo's name is mentioned right at the start of the story in an intriguing way: "It began the summer when Dill came to us, when Dill first gave us the idea of making Boo Radley come out".
Scout describes him as a malevolent phantom. Many rumours circulated about him and children were afraid to go near his house.
In reality, he is a recluse who was emotionally damaged by his cruel father. Mr Radley preferred to shut up his son than send him to an industrial school as a punishment for schoolboy pranks. His older brother, Nathan, took over when his father died.
He is intelligent - one of the items he leaves in the knothole from the children is a school spelling medal. He skilfully carves soap figures.
From his house, he can see the whole of life in Maycomb.
He grows to love the children next door whom he watches - Jem and Scout. He leaves presents for them in the knothole, mends Jem's trousers, covers Scout with a blanket during the fire - and finally saves their lives.
Scout only realises what life is like for him when she guides him home later that night.
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