The 39 Clues

"The 39 Clues" is a multimedia adventure franchise centered on siblings Amy and Dan Cahill, who discover they belong to the world's most powerful family. They learn about 39 clues connected to their family heritage, which also serve as a series of clues leading to a hidden treasure. The story combines books, online games, and collectibles, encouraging readers to solve puzzles and explore history, geography, and culture. It blends storytelling with interactive challenges, fostering critical thinking and teamwork as the characters race to uncover their family’s secrets before others do.