This first book in the series introduces readers to a world where high-tech spy gadgets meet fairies, trolls, and dwarves. And all of it swirls around a twelve-year-old evil genius and his military-trained body guard, Butler (who carries a gun). There is a fair amount of violence, but it is mostly human versus fairy people (who are remarkably tough and carry weapons too). While the threat of death is frequent, and the fights are over the top, no characters die. Artemis' father is missing at sea, and his mother appears to be having a nervous breakdown as a result. Even though he excels at illegal activity, Artemis does appear to have a heart, spending half of his ill-gotten gold on a wish to restore his mother's mental health. In the end, both sides are left with a grudging respect for each other, paving the way for future encounters between the worthy adversaries. Language is very mild–just a few uses of "hell" and "damn."