This is a case of "don't judge a book by its cover". Having read the book, I understand the significance of the pomegrant, but it makes for a rather unattractive cover. If I kept reading the summary, and not seeing the cover, I might have read this a long time ago.
The story itself is well worth a read. It is sad, sombre and serious, and yet humour still shows through in some spots. This humour mostly shows during the interactions between the siblings.
The book starts with a boy and girl who aren't named until well into the book. This lack of naming really helps to highlight the power of names, which is one of the themes of the book. The story follows Assam and Darjeeling (the names the boy and girl give themselves) as they search for their mother in the Underworld. They have adventures, both good and bad along the way. It was interesting to see how each encounter developed and occurred.
Both Assam and Darjeeling grow and mature as the story progresses. It is a slow growth, but still very visible. It was subtle and yet profound.
As the end neared, I was able to guess what would happen, but that didn't make the emotional punch of it any less forceful.
Overall, this was a rich and intriguing story. The "bad guy" was scary and his story was unexpected. There are emotional punches scattered throughout the story, along with giggles and gasps. Overall, I'd definitely recommend checking it out.