I own the rest of the AF series and have read them all numerous times, so I was very excited to see another one, even one as short as this.
It was a quick and simple read, which was what I was expecting. It was nice to see something more from the characters I love. In particular I liked the scenes between Artemis and his mother, Angeline, which you don't see in the other books. It humanises Artemis and the reader can relate to him but, at the same time, he remains the cold-hearted genius that the reader knows.
It wasn't up to the rest of the series in terms of plot and humour, but considering the fact that it's about a tenth of the size, I wouldn't expect that. It also fits neatly into the already established books, taking place between the first and the second.
I would recommend this book, although I prefer the rest of the series.