R
Rick Riordan
The 39 Clues
The 39 Clues series follows Amy and Dan Cahill as they race against other family branches to find 39 clues hidden around the world. These clues lead to a powerful secret, mixing mystery and history for young adventurers. It's a global scavenger hunt where every discovery brings them closer to the truth.

Maze of Bones
The 39 Clues #1
One False Note
The 39 Clues #2
The Sword Thief
The 39 Clues #3
Beyond the Grave
The 39 Clues #4
The Black Circle
The 39 Clues #5
The 39 Clues
The 39 Clues #6
The Viper's Nest
The 39 Clues #7
The Emperor's Code
The 39 Clues #8
Storm Warning
The 39 Clues #9
Into the Gauntlet
The 39 Clues #10
Vespers Rising
The 39 Clues #11
The Black Book of Buried Secrets
The 39 Clues
Mission Atomic
The 39 Clues: Doublecross #4
The Medusa plot
Cahills vs. Vespers #1
Złodziej miecza
The 39 Clues
The Dead of Night
Cahills vs. Vespers #3
A King's Ransom
The 39 Clues: Cahills vs. Vespers #2
Nowhere to Run
The 39 Clues: Cahills vs. Vespers #5The main series should be read in publication order, starting with "The Maze of Bones." There are also several spin-off series, such as "Cahills vs. Vespers" and "Doublecross," which expand on the original story and can be read after the initial series.
The series was optioned for a film adaptation by DreamWorks, though a movie has not yet been released. There are also several video games and a card game based on the series.
The series features contributions from multiple popular authors, including Rick Riordan, Gordon Korman, Peter Lerangis, and Jude Watson, each writing different books within the main series. This collaborative approach brings diverse voices to the overarching narrative.