The 39 Clues: In Too Deep: Book Six

Enhanced descriptions from Syndetics:

Could Amy and Dan's biggest enemy be . . . a friend? Book 6 challenges everything you thought you knew about the Clues race. A hint from their parents' past puts Amy and Dan on the trail of secrets their grandmother Grace would NEVER have wanted them to know. Awful memories begin to crowd in on Amy, just as her enemies circle closer. How far would she go to protect Dan? How much of a Cahill is she prepared to be? Perhaps Grace was right - some secrets are better left buried.

Reviews provided by Syndetics

Booklist Review

In the sixth volume of the 39 Clues series, Amy and Dan fly to Australia. Attempting to trace their late parents' journey eight years earlier, they link Amelia Earhart's last flight to their own family quest. While Amy deals with increasingly intense memory flashbacks related to her parents' deaths, she and Dan must cope with ravenous sharks, poisonous spiders, and their rivals' fiendish schemes. The spy-versus-spy mentality will keep readers guessing as they try to separate deception from reality. Although the complex backstory looms large, the series' fans will devour the breathless action scenes in this fast-paced adventure.--Phelan, Carolyn Copyright 2010 Booklist