Bad Machinery tells the stories of three schoolgirl sleuths and three schoolboy investigators attending Griswalds Grammar School in Tackleford, UK. While not exactly enemies, a mixture of pride, mistrust and stubbornness keep them at odds. Tackleford, a medium-sized West Yorkshire city set among rolling hills, has a long history of mystery. Since the industrial revolution, it has been a hotbed of problems, issues, manifestations, bad deeds, schemes and trouble. Griswalds is in the leafy suburb of Keane End. Nothing else is certain.