Luke and Lexi Cooper are 10-year old twins who have to move abroad every few years for their parents' jobs. They're used to exploring new places, but this time, they'll find out a family secret that will turn their travel into big adventures. In this book, the twins head to Melbourne, Australia. Along the way, they learn bits of information about the country and experience things they'd never see anywhere else. They get more than they'd bargained for, though, when they ignore their parents' directions.