Since you did not specify any book in particular, let's focus on what plot means and looks like in a fiction book:
The word plot is a literary term used to describe the relation of events within a story and how they contribute to the overall outcome of the story. Most typical plots follow the same basic structure: exposition, rising action, climax, falling action, and resolution. The story begins with the exposition, which the author uses to introduce the setting and characters; then, the rising action occurs, usually a series of related events in which the protagonist (main character) of the story must work out or solve some type of conflict. The most tense and pivotal moment of the story is called the climax; it is usually a moment of truth in the story and could involve a fight, battle, or decision to be made. After climax, the following events are called falling action which helps to bring the story to the final moments, the resolution. By the time the reader reaches the resolution, the conflict has been resolved, so the author ties up or explains any loose ends to the story.