Young Harry Newman makes it his mission to discover why his hometown in South Australia is secret, protected and hidden from the rest of the world. Officially, Drocernoton does not exist. The town was established for one reason: the RAAF base. It conceals a revolutionary new craft, fully controlled by master computer Candy. Candy never takes orders from anyone, has a disturbing sense of humor, and loves pranks. She encourages Harry and his friends to travel to Pluto, but there's a catch. Harry has a time limit to explore the planet before the craft automatically returns home. But when the teenagers step off the craft, they fall down a tunnel. There they meet Shanikah, an alien girl who will help them return home. When the planetary police discover them, they are immediately arrested on spy charges, but during the trial, the judiciary has trouble understanding the boys. In order to get back to Earth, they must escape with the help of Shanikah and follow secret passages.