The Missing Melbourne Coins

Just before they board the plane to Melbourne, where they are headed on a pretty epic school trip, Amelia and William are presented with an unexpected development. Involving a missing chest of coins worth a fortune, this development has them racking their brains for the entire 21-hour flight. They will need to rise to the challenge, think fast, and put their knowledge of Melbourne and Australian history to the test, because they are not the only people on the plane who are on the same mission...