In the fourth book of this series, our main character Sophie and her friends escape to the Black Swan, having just figured out that there is a second rebel group (aka the Neverseen). To keep their families safe and avoid the Council’s punishment, they leave. Upon getting to the Black Swan’s hideout, they meet an old gnome named Calla. She tells Sophie that she helped make her during the experimental stage of her creation. She also talks about a plague that has been killing gnomes. Sophie, (being the curious girl she is), decided to do some research. Mr. Forkle has other plans. He wants to only use this time to read and research. Nobody liked that idea (especially Dex and Keefe)!
This is one of my favorites in the series. It has the best ending so far, and it is tense (but still exciting). I can see major character development within all of the characters, and it is when many memorable actions happen. Some of which are Fitzphie jokes, meeting the twins Tam and Linh, plus some miniature showdowns with various different people. I very highly recommend reading this series, you can get very invested in the series quite quickly.