The term "dictionary" should actually better. The book is extremely comprehensive, provides a wealth of information on everything that is present in the saga written by Rowling. It is also interesting to see that the author notes when added to references that inspired the latter as well as translation differences found in the French version. However there is no illustration, so the book was more like a dictionary in terms of form. I recommend this book to those who love Harry Potter to delve into this universe and discover many details often go unnoticed