If you are not familiar with the world of the Avatar there are four different realms of 'bending' or mastery of the elements: air, fire, water, and earth. Aang, the principle character, is the last Airbender and the one who is destined to be the Avatar, or person who is to master all four bending traditions in order to save the world from the dominance plans of the Fire Nation.
As for the book itself, you should know that it is a graphic novel. If you are not familiar with what a graphic novel is, think of it as an upgraded comic book. The paper used in this series, for example, is glossy and sturdy and the color runs from edge to edge. And in this particular volume the adventure begins with two siblings, Katara and Soko, who rediscover the frozen Aang in the far north. It then follows the three young people and their animal friends to the point where they find the northern water bending tribe as well as an abandoned Fire Nation ship where two of them get trapped.
Now we purchased this book as part of our never ending search to find material that will be both interesting and challenging for our soon to be 7 y.o. daughter. If you are in the same boat you know there are a great many 'readers' that are not suited to children who read at, or above, age level. Either the word level is right but the plot is too babyish (even for a first grader), or else, the plot is interesting but you'd have to have a fifth grade vocabulary to deal with the text.
Well, this book almost fixes those problems. The Avatar story is extremely good. However it turns out, in our case, to be a little bit too challenging. [Note: that might not be the case for your child. But read on.]
The problem we faced was not the vocabulary per se -though it was challenging -- but rather the font. The one the publisher/artist/someone chose is small, slants and places the words close together - at least for a first grader. A more advanced reader probably wouldn't have these problems.
Five Stars. Outstanding storyline. Good Read-aloud: both my 5 and 7 y.o.'s enjoyed it. (Okay my husband and I did too.) The artwork is fun and expressive and humorous. I would say the reading level is fairly advanced with words such as: paranoid, penguin, sequence, ruptured, and revealing. In addition, for younger readers, there could be a problem with the font and word spacing.
My advice would be to buy it, try it as a reader, and if it's too much for your youngster(s) read it to them.