The 39 Clues: Cahills vs. Vespers Book 6: Day of Doom

Interest LevelReading LevelReading A-ZATOSWord Count
Grades 4 - 8Grade 5n/a4.554977
The Ultimate Sacrifice

It started with a kidnapping. A shadowy organization known only as the Vespers snatched seven members of the Cahill family and demanded a series of bizarre ransoms from around the world. Thirteen-year-old Dan Cahill and his older sister Amy began a global treasure hunt, determined to bring back whatever Vesper One needed, so long as it kept the hostages safe.

But when they deliver the last ransom, Amy and Dan discover Vesper One’s terrifying endgame. The objects he demanded are vital pieces in a Vesper plot that will harm millions of innocent people. Now the two siblings and their friends are in an all-out sprint to stop Vesper One . . . before the whole world goes BOOM.
Hardcover, 272 pages
Published on March 5, 2013 by Scholastic Inc.
ISBN-10: 054529844X
ISBN-13: 9780545298445
9 Book Reviews
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  • oofman
    oofmanThursday, January 31, 2019 at 10:17 am44 stars
    it is good because you never know what happens next. but it is also kind of scary so try it if your brave
    • goals
      goalsThursday, May 19, 2016 at 5:52 pm
      The series was good but this book kinda ruined it all. Why Evaaaaaaaaaaaaaaaaaaaaaaan
      • sharkbomb85
        sharkbomb85Sunday, May 8, 2016 at 11:53 am55 stars
        This book continues the battle between the Cahills and the Vespers, and it pops up some funny little scenes.
        • penguin313
          penguin313Wednesday, April 22, 2015 at 4:42 pm55 stars
          A good ending to the second 39 clues series. In this book, the Cahills fight their final battle against the Vespers, and find out the identities of their leaders.
          • deathknight
            deathknightWednesday, January 8, 2014 at 1:51 pm55 stars
            This book is the best book ever!! This book is the book with the most interests! Amy and Dan Cahill try to stop Vesper One's plan and save the world. Read this book for the shocking conclusion .
            • lollipopping
              lollipoppingFriday, October 18, 2013 at 10:34 pm11 star
              I read some reviews with solid information about it, and the book doesn't sound so interesting. I wouldn't want to read it. Too bad. It could have been better.
              • goals
                goalsFriday, August 12, 2016 at 8:19 am
                Yeah it was not that good. Too bad to end
              • singstar66
                singstar66Sunday, October 6, 2013 at 1:14 pm55 stars
                This is a good ending for the second series.
                • miss_gold1
                  miss_gold1Saturday, September 28, 2013 at 11:48 pm55 stars
                  I'm reading this book now it's so good you can't stop reading it I wonder what happens in the end!!