39 clues In Too Deep by Jude Watson *****

In Too Deep is the 6th book in the series called "The 39 Clues". In this book Amy and Dan Cahill go to the Land Down Under to discover what there own Mother and Father knew about the hunt for the 39 clues. Soon they meet there Older cousin Shep, an Aussie that was close to Amy and Dans Mother and Father

and he has a plain.

But with allies there will also be enemies(or rivals). In the land down under they bump into there enemies Mother. Isabel Kabra pretends to be helping Amy by telling her that Irina( Isabel ally) kill her parents by starting a fire. Later in a mine in Coober Pedy that they find out that a Cahill had the clues he needed but his lab was on Krakatau when it erupted. They didn't find a clue from the trail thay were on but by Irina telling them a clue.