Tom, Lucy and Rags the dog fall through a trapdoor in a mysterious treehouse. They find themselves in a strange land with transparent birds and talking trees. Mistaken for Princess Diana of Bongo Island, Lucy is kidnapped by pirate Captain Black Jack McGregor. The children find themselves in adventures with a volcanic island, a bunyip, a zany queen, and professor Crankwhistle's steam-driven air ship.
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