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Uncle Floyd went down the horrible hole in the ground and did not come out. Morgan has to go down the mine to look for him. What he finds is amazing. A secret town has been built under the ground. When Morgan is found by the town's little army he is imprisoned. Nobody must know of the rich reserves of gold there, because discovery would surely mean that large mining companies would come and destroy the beautiful valley. How can Morgan be freed without the destruction of the valley and its farmers?
