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اسم المؤلف    Thea Stilton

Join Thea Stilton and the Thea Sisters on an adventure packed with mystery and friendship!

While Violet is taking an art class in the Netherlands, her friend's father mysteriously disappears! The missing mouse is a renowned botanist -- and his disappearance is linked to the rare black tulip. The Thea Sisters are eager to help find him. It's an adventure through the windmills, flowers, and canals of Holland!