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Geronimo Stilton, the home-loving editor of El Eco del Roedor, falls in love with a visiting beauty and lets himself be persuaded to join an expedition in search of a rare butterfly supposedly living in a hidden valley.
Geronimo Stilton, the home-loving editor of El Eco del Roedor, falls in love with a visiting beauty and lets himself be persuaded to join an expedition in search of a rare butterfly supposedly living in a hidden valley.