Two naughty Knockers -grubby trolls who wear miners boots and eat pasty crusts for those of you who don’t know- have been stealing from their community. With no-one else to turn to, it is up to Austin to help his friends out and bring the thieves to justice. However, things take a dangerous turn when the knockers take something explosive and Austin is forced to embark on a very different adventure which will take him underground through perilous tunnels and out into the wild
sea. With the help of new friends, in the shape of sea serpents and Bramble, a female knocker who used to be a wrestling champion, Austin finds himself in a race to save the lives of the magical underground world- but will he succeed? Enjoy the ride as the Cornish coast provides another dose of adventure and magic that children and adults alike with enjoy and remember for years to come.