An important scene is when Jem and Scout meet Dill.
When Jem, Scout, and Dill go and knock on the Radley house door helps provide the suspense of Boo Radley being so scary.
Atticus defending Tom Robinson was important for advancing the story for the ending.
The story "To Kill a Mockingbird" writter by Harper Lee is told by a young girl named Scout Finch who lives the life of an innocent girl making friends. The story start out with her and her brother Jem making a new friend named Dill the neighbor kid who will be staying the summer. Jem tells Dill about Boo Radley and one night they knock on his door which was followed by less important tell of events. Atticus who is Scout's father is a lawyer and in the book has to hopelessly defend Tom Robinson, a black man, for being accused of raping one of the Ewell girls. A while goes by and Jem and Scout are at a halloween play walking home when they were attacked by Bob Ewell but is fought off by Boo Radley. In the end Boo comes out and Scout and him are friends while the sheriff and Atticus agree to let Boo Radley's crime go.
Arguably the most important scene in the whole book is when Bob Ewell attacked Jem and Scout and Boo Radley came out of nowhere and defended them.
The final scene when Boo comes out and Scout and him become friends is the finishing touch on a well written story.