So what are you saying, Josh?' Lindsay asked me, `that there's a secret Roman town down here where people speak Latin and which nobody knows about in the world we come from?'

This extraordinary, highly imaginative, hugely entertaining novel tells the story of fifteen-year-old Josh Moonford, his younger twin brother and sister Sam and Dora, Cornish girl Lindsay Penhaligon, warm-hearted gang leader Troy Wilson and arrogant sixth-former (and self-proclaimed genius) Declan Jacques, and their mind-blowing adventure in the underground high-tech Roman world of Cantia, located beneath the famous cathedral city of Canterbury.
Can Josh and his friends - aided by the world-famous movie star Carlo Clancy - end the brutal Cantian revolution that could lead to disaster for our world?