A primary school coach trip to Alton Towers turns into a rollercoaster journey to the underworld.

Is their teacher kidnapping them as part of a worldwide conspiracy? Are they going to have to face the Doctor? Is Tricia really a schoolgirl spy? Or are they simply on a day trip to Alton Towers? Oh Yeah, and who nicked James' Twix? Join Tricia and her classmates on their odyssey into the paranoid, unscrupukous and hilarious world of the eight-year-old imagination.