In all of Tolkiens works, including Lord of The rings, but to a largher extent The Silmirilian and History of Middle Earth, the author will make referance to a fictional creature or location in varying ammounts of detail. When reading the books it is very easy not to understand or remember the significance of a referance, or a character mentioned. Similar in sturcture to the Bible, History of Middle earth mentions peoples father and home lands that are very hard to loose track on.
This is where this excellent companion comes in. Since i have bought it i have not once read a Tolkein book without this at my side incase there are referances to places or things i have forgotten. It truely enhances the experiance of reading, and having a full understanding of Tolkiens vivid immagination. With over 70 pages and thousands of entrys this is a truly detailed companion.