The Jefferson Puzzle, also known as the Cahill Fire Painting, is a picture of the Cahill Fire and is obtainable via collecting cards. The picture depicts four of the children of Gideon Cahill (from left to right, Katherine, Thomas, Jane, and Luke) and their mother, Olivia (far right), with Gideon himself inside the burning house.
Each book in The Clue Hunt series includes a card with a piece of the puzzle on its back. The name of the puzzle comes from Card 6: Thomas Jefferson, the first card in the puzzle.