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 runs aground after it drops out to rescue a local boy, Kimba, stranded on the rocks. When the ship's dog, Henry disappears, Kimba helps them find him. But they begin to realise that a missing dog is the least of their problems...