In chapter one the three main characters are introduced. These people are Scout (narrator- and main character, Jem (Scouts brother), and Atticus (Scout, and Jems father.)
Scout and Jem started finding items in a tree knothole and to their delight it had gifts so to speak. They found chewing gum, pocket watch, a doll and several other items.
Scout and Jem plus a new character Dill sneak into Boo Radleys back yard to see if they can peak into their home to see him. Well that plan totally back fired for someone came out to get them and in the heap of the moment Jems pants ripped off and they were able to escape unseen and still alive!
From the last chapter when Jem lost his pants trying to escape he knew he had to get them back and went in to the dark side.
Atticus represents Tom Robinson and is hated for it but its a big deal and leads to a lot of criticism.
Ms Dobouse dies of her longtime sickness but she dies not addicted to her morphine in which is a success in its own.