The answer is "find the other ekaterina scientist who came too close".
Anne Cahill Did Not Drown
The odd symbols in the 3rd book of the 39 Clues series are part of a secret code that readers can try to decipher to unlock hidden messages or clues within the book. It adds an interactive element to the reading experience and adds to the mystery and intrigue of the story.
there is no page clue in 39 clues book 9
they are clues to finding the answer to the mystery it tells you on the first page of the book
clue moved for safekeeping
The answer to The 39 Clues book 1 page puzzle is "Maggie Powers."
The answer to the Book 11 puzzle in The 39 Clues series is "Kobold".
I don't know the answer on the inside page, but several pages have Morse cod eon them. Decoded it says "There is another madrigal watcher"
page 183
Look To India
284 Main Street.
The book number in an Australian passport is typically located on the second page, near the top right corner. It is usually a 9-character alphanumeric code.