Card 4: The Titanic is the 4th card in The 39 Clues. It comes with The Maze of Bones.
"On its first voyage, the luxury liner RMS Titanic hit an iceberg and sank. 1,517 people died, 706 survived, and only 333 bodies were recovered. Cahills have long believed that one of the 39 Clues was on board, but no one knows if the Clue sank to the bottom of the ocean or made it to America with a survivor. Finding out WHO was transporting the Clue is key to discovering what happened to it. The three circled names on this list are the Titanic passengers the Lucian Branch thinks were most likely to be carrying the Clue. Which one was it?"
Top Secret Edit
It shows a website about the findings of Titanic's monthly bulletin.
Question: "Which of the three circled passengers is the Cahill?"
Answer: Nella Chain
Nella Chain is an anagram for Anne Cahill. If you crack the code hidden in the pages of The Maze of Bones, it says, "Anne Cahill did not drown."
This card, combined with Card 1, Card 2, Card 3, Card 5, and Card 6, forms the Clue Iron Solute.
This card, combined with Card 5, Card 15, Card 27, and Card 49, forms the Clue Phosphorus.