A multi-author adventure series following siblings Amy and Dan Cahill in a global race to collect 39 Clues hidden around the world that reveal the source of their family's extraordinary power. The multimedia series combines fast-paced historical mysteries, family intrigue, and dangerous adversaries across multiple books by different authors, designed to spark curiosity about history while delivering thriller excitement.
Siblings Amy and Dan Cahill are thrust into a dangerous global race to collect 39 Clues hidden around the world that, when combined, will reveal the source of the Cahill family's extraordinary power a secret that has shaped history. The first book in a fast-paced adventure series blending historical puzzles with thriller action, set in motion when their grandmother is murdered. Accessible, exciting, and designed to spark historical curiosity.