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The three children find a cave containing relics of a previous civilisation. Meanwhile, Wedgwood is trying to reach them. Then the children make another startling discovery.
Professor Wedgwood's children have brought his supply rocket to the moon. But the rockets have landed 150 miles apart. Both parties discover that someone has already been to the moon.Then Jimmy disappears.
Professor Wedgwood's amazing discoveries on the moon indicate a previous landing sometime in the distant past. Will the alien spaceship reveal its secrets?