I'm not really a fan of this book. For me it was just too young for me.

The main characters are a group of mechanicals; Christopher, Jack, round Rob, Manda and Gripper. When Christopher goes missing the rest go off on an adventure to find him. I also thought it might be more to do with the wizard of Oz due to the title and cover picture but instead it was more futuristic (mechanical people).

There few secondary characters because there are so many main characters.

The storyline is OK but it was aimed at a much younger audience so it wasn't all that exciting for me to read. The pacing is good but again it was not so exciting for me to read.

2 stars a bit to young and boring for me.