by Geronimo Stilton (Author). It was the strangest thing... all across New Mouse City, rodents kept telling me I'd done things I had no memory of! I soon discovered why... there was a Geronimo look-alike out there, pretending to be me. He'd even fooled my sister Thea! And worst of all, he was trying to take over my newspaper. I had to find a way to strike back -- but how??