It starts with the main charecter scout finch, his father is atticus finch and his father was also a attorney whos trying/tried to prove innocence to this one black man who has accusations of rape. That's basically a summary your welcome.
Yes it is becase a Metaphor is The use of a word or phrase to refer to something that it is not, invoking a direct similarity between the word or phrase used and the thing described (but in the case of English without the words like or as, which would imply a simile); the word or phrase used in this way; an implied comparison.
It's basically just saying to appreciate everything you have in life, whether you have a lot or a little. It also says that objects don't make happiness.
