What is the plot of the 39 clues book 1 the maze of bones by Rick Riordan?

In "The Maze of Bones," written by Rick Riordan, the plot follows siblings Amy and Dan Cahill as they embark on a worldwide treasure hunt after their grandmother's death. They must solve a series of clues left by their ancestor, Benjamin Franklin, in order to find the source of the Cahill family's power. Along the way, they encounter danger and betrayal from other family members also competing for the ultimate prize.