A funny, nail-biting adventure set in Sydney, Australia involving 10-year-old Leonie and her brother Lionel. After finding a green suitcase washed up at the beach, the pair must solve bizarre riddles, figure out clues, find secret items, escape from a tv-addicted nanny & steer clear of royally suspicious characters! But do they have what it takes to solve the madcap mystery, before time runs out?