In Too Deep - The 39 Clues, Book 6 Author:Jude Watson 14 year old Amy Cahill, her 11 year old brother Dan Cahill, and their older babysitter au pair Nellie Gomez head to Australia to discover what their mother and father knew about the clue hunt and went to different places with a jet. There they meet their friendly surfer cousin Shep Trent, who helps them by transporting them where they need to go... more » in his plane. Amy and Dan are on the trail of a mysterious criminal known only as Bob Troppo, and they also discover a secret expedition their parents went on around the world to look for clues. But following her parents' footsteps reminds Amy of the memories she had of the night her parents died. Memories so painful she can't even bear to share them with Dan« less