For a three-act plot analysis, put on your screenwriter’s hat. Moviemakers know the formula well: at the end of Act One, the main character is drawn in completely to a conflict. During Act Two, she is farthest away from her goals. At the end of Act Three, the story is resolved.
Act I
Atticus makes it clear to Maycomb that he’s going to defend Tom Robinson to the best of his ability.
Act II
The Robinson case goes to trial and the jury finds Tom guilty.
Act III
Ewell attacks the Finch children and dies; Scout meets Boo Radley.