제로니모 스틸턴, 위대한 쥐 모험가에게 또다른 위험이 닥쳐왔다. 모험가이며 저술가이자 동시에 신문사장인 그가 그와 아주 똑같은 또 한명의 인물로 인해 곤란에 처했다. 그가 스스로 미쳐서 그가 했던 일을 기억하지 못하는 것일까? 아니면, 정말로 다른 누군가의 음모였을까?
There is a sentence, retributive justice. If we do something really bad, than it will return to ourselfves. Sally was that case. She tried to make Geronimo, the real advanturer in danger. She employeed a man named Sydney, who really looks like Geronimo and make his company belongs to her house. But, Geronimo and Thea were more smart. They made Trap, who has the same size of Sally looks really like her and return them to Geronimo.
Geronimo was in really big danger, but he could endure that case by his family. Family is one of the most important thing to help him. Next, maybe Geronimo will go to the new adventurous city.