In Search of the Castaways

Youngsters Mary and Robert Grant are under the care of the French professor Jacques Paganel, who is a friend of the family. He looks after them, and he helps them to stow away on board a yacht where they hope to convince the captain to steer them in the direction of a secret treasure alluded to in a coded message that Jacques found in a bottle inside of a shark. The captain is arrogant but intrigued, and his son is very interested in Mary and will do whatever is necessary to secure her affections. The journey is replete with exciting challenges and dangers, from shipwrecks and earthquakes to floods and volcanic eruptions. At every turn, they must face fearsome conditions while learning how to trust each other so that they can work together for each other's benefit. As they push through the fierce weather and threats from outside forces, they grow ever closer to their goal and the possibility of retrieving the legendary treasure.