This book is about the role given to geronimo that is he has to get the important envelope on the day of meeting. Meanwhile his grandfather whilly was holding the meeting because for the envelope.so he tells geronimo to collect the envelope at the morning.so he goes back to his room and he tried to get the envelope but when he opened the door the envelope cover flies out of the window .soon he started to catch the envelope but he couldn’t the envelope flied. He decided to find out the envelope and his friend kornelius came to help geronimo but he resist his friend help but in the end his friend only found the envelope.I love to read the series of geronimo stilton thats why I picked this book and I thoroughly enjoy reading this book.I found this book is really very interesting about the adventures of geronimo stilton and how he went through all his struggles . I finished reading this book as soon as quick because this book is very interesting and brings curiosity to read whats going to happen next and how he found the envelope at the end.I really recommend this book for every kids as well as the people who love adventure because this book series is fully based on the adventure.