In Too Deep is the Sixth Book of the First Series of the 39 Clues, and was written by Jude Watson. The historic Cahill in this book was Robert Cahill Henderson, an Ekaterina, and he was the only fictional historic Cahill in the series.
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This article contains plot details about an upcoming episode.
"You are afraid of everything except what you should fear."
Irina Spasky ~ Pg.54
- One sprig of Rosemary (This is not the clue unlocked with the book's cards, but was given to Amy by Irina Spasky in the book.)
To get this code, look on the inside front cover. The numbers on the plane are the page numbers each word is on.
In order, the code is: Find the other Ekaterina scientist who came too close.
To: All Tomas
From: Ivan Kleister
Re: Clue hunters needed
It's time for the Tomas to step up our game. I'm sending ALL agents into the field to find the 39 Clues. We've been playing some good defense, but now's the moment to go for the jugular. Remember, success is 10% determination and 90% doing whatever it takes to CRUSH the competition. Show some good hustle and get out there.
P.S. Bonus points will be awarded for convincing the Holts that there's a clue in their basement and then locking them inside.