The bestselling series returns with an even deadlier challenge, as a new enemy is revealed to be searching for The 39 Clues too...Amy and Dan's race to save the hostages reaches its thrilling conclusion. Who will be victorious? The Cahills or the Vespers? More Library editions available: CAHILLS VS VESPERS 1: THE MEDUSA PLOT (9780545324090), CAHILLS VS VESPERS 2: A KING'S RANSOM (970545324106), CAHILLS VS VESPERS 3: THE DEAD OF NIGHT (9780545324120), CAHILLS VS VESPERS 4: SHATTERPROOF (9780545324137) and CAHILLS VS VESPERS 5 (9780545324151).
- ISBN10 0545324165
- ISBN13 9780545324168
- Publish Date 5 March 2013 (first published 1 March 2013)
- Publish Status Out of Stock
- Out of Print 15 May 2013
- Publish Country US
- Imprint Scholastic US
- Format Paperback
- Pages 336
- Language English