Katie Peridot quite likes being ordinary.Unfortunately, some very out-of-the-ordinary things have been happening to her. On top of this her best friend, Mayuri, isn't her best friend anymore, a sinister sponsorship programme is taking over her school, her mother is acting more crazy than usual and the only person who really seems to understand her is a peculiar cleaning lady. Then she teams up with Themba, the cleverest (and most unpopular) boy at school, and together their investigation takes them deep into the town's abandoned mine. What they find there is more terrible than they could have imagined. Can they save Witchfield before it's too late?