Describe the pacing of the book. Is it patient and detailed, or does it contain a lot of dialogue and brief paragraphs? Is it a reflective story that takes time to build, or is a page turner? The pacing of the story may help reveal its intended audience, as commercial books tend to have faster pacing.
Describe "the call to action" which drives the protagonist, and compels him to perform the main action of the story. Also, see if there is a trigger; an initial event which drives him to act on his desire. This will be towards the beginning of the story.
Note the major plot points in which the main character experiences conflict or confrontation, and responds to them. This should occur through most of the story. When writing about it, avoid being too detailed. Elucidate on where they occur in the plot, and how the tension builds with each one.
Evaluate the climax of the story. When describing it or critiquing its effectiveness, assess the intensity of the climax and duration, determining if it is successfully proportional to the length and style of story. For example, some literary stories may have an understated climax that allows the reader to interpret its intentions, while commercial books will try to have a "blockbuster" crisis that entertains the reader.
Note how the story resolved itself, or what it decided to leave unresolved. This is often called the denouement. When writing about it, consider what was left to interpretation and the reason the writer made that decision.