The 39 Clues: Cahills vs. Vespers is the second installment of The 39 Clues series. All main characters return, this time united against a new enemy: the Vespers.
Cahills vs. Vespers, and Unstoppable are both ideas from the mind of author Jude Watson.
Books[]
The Medusa Plot by Gordon Korman
A King's Ransom by Jude Watson
The Dead of Night by Peter Lerangis