The hunt for the hundredth key / illustrations by Alessandro Muscillo (design) and Christian Aliprandi (color) -- Mini mystery: The double cross / illustrations by Elena Tomasutti (pencils and ink) and Davide Turotti (color) -- Geronimo's jokes.
Summary:
Geronimo, Thea, and their cousin Trap explore an old castle built by Grant Gentlemouse, the founder of New Mouse City, and when they find one hundred keys and only ninety-nine doors inside, they set off in search of the missing room.
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