Lovely young Carla Ponce, who lives in Peru, invites Nancy and her friends Bess and George to visit her and solve her 'monkey mystery,' which promises to lead to a fabulous treasure. A clue is carved on an intriguing wooden plaque that is so old, most of the crossword cipher is obliterated. When a notorious gang headed by El Gato (the Cat) steals the priceless relic, Nancy’s hopes of solving...
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