In Too Deep: 05/29/13
In Too Deep by Jude Watson is the sixth of the original 39 Clues series. Tracking down a family memory, Dan and Amy go to Australia, hoping to learn more about their parents. On their trip, they are helped by a long lost relative — and Nellie reveals skills above and beyond the average teenage au pair.
The second half, though, cranks things up — putting Dan and Amy in the first real danger they've been in since The Maze of Bones. They must face another fire, a volcano, the death of one of their rivals, and the police.