What is the mystery of the hardy boys 143 the giant rat of sumatra?

In "The Hardy Boys #143: The Giant Rat of Sumatra," the story follows the Hardy brothers as they investigate mysterious occurrences involving a giant rat in Sumatra. The brothers must uncover the truth behind the legend and solve the case using their detective skills and teamwork. The mystery unravels as they encounter danger and suspense in their quest for the truth.