I was surprised at how much I have enjoyed reading Gustav Gloom to my kids, ages 8 and 10. The story moves along at a brisk pace, and I found myself continuing to read the book after they went to bed. Some elements may be a bit too scary for kids under 7 or 8, but if you are looking for a children's book that will provide a fun, challenging read for kids aged 8-15, you will find few that are better than this.
I cannot wait to see further adventures in Gustav's world. Highly recommended