The main problem discussed in the book is "changes" and how people react to it. By using four fictional characters in the story, author basically wants to show us four types of people in real life and four different reactions to the changes. After reading the material, everyone could personalize one of the characters to himself and that will show you where you are in life. Even though the story is fictional, the result in the end is real. Spencer shows real life consequences that happens to any of the characters according to their reaction and action to the changes.
The book is really like a moral and I believe it's one of the most important morals in life, because I believe that based on your reaction to changes you get the certain results. On the other hand, certain results come from having a certain reaction to changes. So if you want to see what might happen to you, read this book, and it will be like a laboratory experiment looking at the mice and watching what happens to each of them based on their behavior.
So, who are you in the story? Or maybe more important, who are you going to become after reading this book? Share your thoughts!