Jonah reminds me of Job. Really, when you read this book, you will quickly relate Jonah's life with that of the Biblical Job.
Jonah is a quarterling, a child who is descended from a human and an angel. He is constantly being tested. The suffering the character faces can be difficult for the reader. This is the third in the series, and the hardest to read. I've grown to like these characters. It's tough to see them suffer through the various trials heaped upon them.
This is the best book in the series so far, Each book is better. Jerel Law has found a wonderful way to explain faith to young readers.