I felt that this book wasn't quite as good as the last three as David Rain isn't in it a lot, and the parts he is in, he seems like a completely different person. He was my favorite character, so I was slightly disappointed with this major issue. But he is well written in the parts that he appears in, even though he feels like a completely new character.
But other that minor problem, this book is great. This book and the ones after it, feel like a separate part of the series as it gets a whole lot deeper. The Fire Eternal is an amazing book that I just feel in love with.