I wish i had this book as a reference when i was reading the first 4 of the series. It gives a synopsis of the first several books, and then delves into some of the "why" questions for character development.

If you have already read the books, and wondered how to pronounce all the Gaelic words, this book tells you the phonetic rules for Gaelic, and how the words are used. It also tells you some of the nuances of meaning that aren't obvious in direct translation. The words are arranged by book - so you can use it as sort of a concordance as you are reading.

There were sections that i didn't bother to read, such as the astrological charting of the main characters. C'mon, i DONT CARE. I -did- enjoy the sections that discussed how Diana developed her characters early in books so that she could use the details in later stories. Very nice !