Ben and Fee MacTavish and the rest of the School Ship Tobermory crew head down under to take part in a tall ships race, but after a good start the Tobermory drops out to rescue a local boy, Will, stranded on the rocks. When the ship's dog Henry disappears, Will helps Ben, Fee and their friends find him. But as the trail leads them deeper into the Outback, they begin to realize that a missing dog is the least of their problems.