From the article:

"Bad Machinery" tells the stories of three schoolgirl sleuths and three schoolboy investigators attending Griswalds Grammar School in Tackleford, United Kingdom. While they are not exactly enemies, a mixture of pride, mistrust, and pig-headedness keeps them at cross purposes. A medium-size West Yorkshire city set among rolling hills, Tackleford has a long history of mystery. Since the industrial revolution, it has been a hotbed of issues, manifestations, bad deeds, schemes, and trouble. Griswalds is in the leafy suburb of Keane End. Nothing else is certain.