For more of the original Dragon Twins’ current story, I recommend you read Pearl’s Dragon before this, if you can do it. This story really starts there with Pearl’s rules and her taser. Barack and Brogan are first referenced in Twin Dragons, book 7, if you want to know more about their first death.
This is a pretty good story that SES has written for the trio, and offers a new, creative and reasonably plausible explanation as to how it could happen.
Brenin does a decent job of narration. He really is the voice for Smith’s books.