I'm a teen's mom. I've read the other books in this series as my teen son did. This book brings in characters from earlier books, so I would NOT recommend that this book be the first read in the series. This book, along with the earlier books involves ethics. This is all too rare in teen's choices in reading. Each wizard, sometime as a child, was offered an opportunity to take the Wizard's Oath, then submit to an ordeal. This is when a wizard has the most raw power available - untempered yet by experience and need for control. Adults are brought into the books as Senior Wizards, mentors for the children. It is a wonderful way of explaining why the children are asked to save or mend parts of the universe when adults cannot. In this book, the stakes are even higher. The adults forget their magic in an evolving crisis with the whole universe at stake. All young wizards, from earth and far away galaxies, as well as other species such as cats and whales get involved. Some of the characters that were important in earlier books are prepared to give their lives for this battle. Some do, some are transformed in some very interesting twists. As each book ended, I wondered how the author could top that book. And then, I was delighted by the next book written, as was true this time.