El laberinto de huesos (Las 39 pistas 1)

Amy and Dan Cahill thought they had nothing. They were just two more orphans in the world until their grandmother's will reveals a secret: they belong to one of the most powerful and enigmatic clans in history. Now, they face a choice that could change everything: they can choose between a million dollars or pursuing a clue that will lead them to an unimaginable source of power. In this race against time, they are not alone. Relatives from all over the world —from eccentric millionaires to ruthless villains— are vying to uncover the ultimate secret. Trust is a luxury they cannot afford, and every decision either brings them closer to or further from their destiny.