The 39 Clues: Cahills vs. Vespers 1-6 eBooks (PDF)

Cahills vs. Vespers is a six-volume series part of The 39 Clues action/science-fiction novel series. The books in the series were written by several well known authors. This series expand the thrilling adventures of Amy and Dan Cahill, descendants of the most important family in the world history, after their 39 Clues hunt. The series received generally positive reception and critical responses, with some volumes listed in the New York Times Bestseller list.

Darkness is engulfing all branches of the Cahill family around the globe. One by one, members of the Cahill family are missing, kidnapped by a mysterious, underground group known as the Vespers. Vesper One, leader of the Vespers, makes their demand, stating that if Amy and Dan want to save the hostage, they will have to pay the ransoms. The ransoms here are several historical items kept in well-secured places and these items will lead to a massive threat of destruction that may end the world.
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