Card Packs are products dispersed for the 39 Clues that include sixteen cards inside of them. Cards that are included in them will or will not help an agent get all 39 Clues, but by getting the cards inside of them, you may complete a Card Combo and receive a Clue. The cards that are in them are random, and so it is possible to get doubles or more. However in the Cahills vs. Vespers Series, the card packs have sixteen set cards.
The Clue Hunt
- Card Pack 1: Secrets and Sabotage (associated with The Maze of Bones, One False Note, and The Sword Thief)
- Card Pack 2: Branch vs. Branch (associated with Beyond the Grave, The Black Circle, and In Too Deep)
- Card Pack 3: The Rise of the Madrigals (associated with The Viper's Nest and The Emperor's Code)
- Card Pack 4: End Game (associated with Storm Warning and Into the Gauntlet)
Cahills vs. Vespers
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