The 39 Clues: Doublecross

Mission Titanic - The 39 Clues: Doublecross, Book 1 (Unabridged)

Jude Watson

Mission Hindenburg - The 39 Clues: Doublecross, Book 2 (Unabridged)

C. Alexander London

Mission Hurricane - The 39 Clues: Doublecross, Book 3 (Unabridged)

Jenny Goebel

Mission Atomic - The 39 Clues: Doublecross, Book 4 (Unabridged)

Sarwat Chadda