Treasure Hunters: The Plunder Down Under (Treasure Hunters, 7)

With their parents in trouble once again, the Kidds must traverse the Australian Outback, recover a pair of stolen gems, and defeat treasure-hunting pirates to save them!
The Kidd family is on their way to Australia to find Lasseters Gold when they are challenged by fellow treasure hunter Charlotte Badger, who challenges them to a race to the gold! But when the Kidds pull into port in Australia, their parents are suddenly arrested -- theyve been framed! It turns out Charlotte Badger is a pirate, and shes planted a priceless stolen black opal on the Kidds ship, The Lost!
Now Bick, Beck, Storm, and Tommy have seven days to traverse the Australian Outback, find Charlotte Badger and her pirate cronies, and bring back the evidence that will prove their parents innocent. If they fail, their parents will be found guilty and thrown in prison . . . forever!