Interest LevelReading LevelReading A-ZATOSWord Count
Grades 4 - 8Grades 2 - 5U4.345905
The first book in the #1 bestselling phenomenon sends readers around the world on the hunt for the 39 Clues!

Minutes before she died Grace Cahill changed her will, leaving her decendants an impossible decision: "You have a choice - one million dollars or a clue."

Grace is the last matriarch of the Cahills, the world's most powerful family. Everyone from Napoleon to Houdini is related to the Cahills, yet the source of the family power is lost. 39 Clues hidden around the world will reveal the family's secret, but no one has been able to assemble them. Now the clues race is on, and young Amy and Dan must decide what's important: hunting clues or uncovering what REALLY happened to their parents.
Hardcover, 224 pages
Published on October 1, 2008 by Scholastic Inc.
ISBN-10: 0545090547
ISBN-13: 9780545090544
202 Book Reviews
  • bsc
    bscTuesday, January 12, 2021 at 11:23 am55 stars
    Amy and Dan Cahill's life changed the day of their grandmother's funeral. Amy and Dan- with all the other Cahill relatives had a choice- 1 million dollars or the first clue. Most chose the money, but some stayed for the clue, including Amy and Dan. Now, the siblings had to find the 39 clues before the rest of their relatives, and stay alive doing it. Near death experiences, clues, mysteries, and an au pair are just some of the things Amy and Dan face. But one thing is for sure- they must stay alive to get the clues. Adventure and mystery makes you keep on reading, and want more once you're finished. Make sure to check out the second book in the Cahill's adventure- One False Note! Happy reading!
    • pianodog8
      pianodog8Friday, July 31, 2020 at 8:55 am
      This book is awesome! It is a little intense and may not be a good book to read if you are younger or sensitive. The characters, SPOILER, Dan and Amy Cahill are great. They are regular but extraordinary kids like us, and have to face choices that a adult can't handle. They have to choose the right or wrong thing, and they always find a way to get through puzzles and shocking truths.
      • sweetcheese
        sweetcheeseMonday, June 29, 2020 at 6:01 pm55 stars
        Oh my gosh Awesome book! Love this book soo soo soo soo soo much! Best book ever ! Need to read the next book !
        • gkfann
          gkfannThursday, June 18, 2020 at 5:25 pm44 stars
          rick riordan starts off the bestselling '39 clues series' with the heart-pounding 'one false note'. It's a really interesting book, the only downside is it is a little confusing, for it is set in a lot of different places, but great book otherwise.
          • judgment11
            judgment11Wednesday, June 17, 2020 at 1:08 pm44 stars
            I like the way there is a conflict/problem that doesn’t stand out. It also tells some things that actually happened. But I don’t recommend this book if you don’t like too much violence. You might want to skip those parts. There is only a few violence. But still enjoy!
            • nac
              nacTuesday, June 2, 2020 at 6:36 pm55 stars
              Two siblings, Amy and Dan, at the death of their beloved Grandmother, find themselves faced with a choice. Continue their normal life with and inheritance of one million dollars, or race against time to find the thirty-nine clues and the reward at the end. Will Amy and Dan be able to get the first of the clues? Or will they give up in despair? This book had so many twists and turns that I couldn't put it down, and the puzzles and clues were interesting and eduational.
              • natcat13
                natcat13Thursday, May 28, 2020 at 11:52 am55 stars
                This is an excellent book about Amy and Dan Cahill. When Grace Cahill dies in her will, she picked seven families to ether choose either 1,000,000 or to go on a treasure hunt to try and find the Cahill family secret.
                • 4usa
                  4usaWednesday, May 6, 2020 at 5:47 am55 stars
                  This is the first book in an incredible series about two siblings who enter a dangerous life or death clue hunt that they feel that there Grandmother was preparing them for! They have to travel around the world in search of these clues that leads to power beyond comprehension before it gets in the wrong hands of the other teams AKA their family members!
                  • 4usa
                    4usaTuesday, January 28, 2020 at 9:21 am55 stars
                    I love this book,it's my new favorite series!It's full of action adventure and mystery!It's a story about two siblings who find out that they not part of one of the most effective and powerful families in the world.When there Grandmother dies she has in her will that each of her closest family members can include themselves in a dangerous hunt for 39 clues that will lead them to the greatest prize imaginable.
                    • aaa57
                      aaa57Tuesday, August 13, 2019 at 2:46 pm55 stars
                      I love this book Dan and Amy’s grandma dies and what she left her family was a hunt for the 39 clues now they travel all over the world to find them but it’s dangerous and Dan and Amy are orphans so the budget is tight join them on this epic quest and read the 39 clues.