Each book of the series corresponds to each school year of Harry's at Hogwarts and this book is, naturally, of the fourth year. Sadly, I can't reveal much more than that, for it may spoil the fun of reading the book. With so many writers freezing up in the second book from sudden fame, money and pressure after smashing debut, it is a nice change to see someone hold up the integrity and quality of the first book up to and including the fourth book. Someone who hates you and is mean to you is not necessarily evil. Someone who looks scary is not necessary frightening.
Rules are less important than people but rules are there for a good reason.
Poverty is hard but you can have fun even though you are poor. Best friends fight with each other, misunderstand each other, become jealous of each other, but reconcile with each other after a heartfelt apology. Not everyone accepts what is obviously true if the truth is scary enough, and so on. The last thing I will say is that I enjoyed the money and time I spent on this book very much, and I am very picky. Oh, how I wish for a child of my own to read this book to.