I first read this in Highschool because I'm from New Mexico. Overall, nothing really happens in the book. I was left waiting for the "coming of age" that never seemed to arrive.
Ultima dies at the end but I couldn't find myself caring - she was boring and her character never felt developed, she was just strange. Throughout the book, Antonio just questions what he wants for his future vocation and never arrives at an answer. He still seemed as oblivious at the end as he was in the beginning.
Ultima ultimately had a very small role, which was just opening his view about spirituality which wasn't even spiritual, just the occult. He supposedly learned the magic she used (which is erroneously alikend to spirituality in the book) could be good or evil -- just like any tool ever -- and he doesn't actually learn anything about good vs evil. Somehow this is relevant to his coming of age? Maybe he thought spirituality was always good, who knows, because it's never explained.
The book also has Antonio questioning his faith, but he doesn't even understand it. It uses some analogy of fish to dumb it down, but honestly I didn't get it because they have too elementary of an understanding of the Catholic faith, so it fell flat.
Antonio never really forms a strong opinion of anything, which is part of why he seems to never "come of age" by the end. But even if he did, he still wouldn't come off as coming off age and more like a teenager. Which he never seemed to turn into. I spent the whole time reading the book waiting for something interesting to actually happen. It was ridiculously boring and I'm disappointed that this is among the best writing New Mexico thinks it has to offer.