Arun Shah, the head of the animal rescue center, asks Lisa, Sarah, Sofia, and Hannah for help. He has found an old letter in documents he had long forgotten, and this discovery won't leave him alone. The letter was once given to him by an old chief who used to live nearby and is said to contain clues to a hidden treasure. Of course, the girls are thrilled. But just as they decipher the first clue, a second one awaits them, leading them further into the mountains. They solve clue after clue until they finally discover a carved alder in a box between the roots of an old tree. But what does this mean?.