Geronimmo Stilton, Secret Agent

Geronimo finds himself looking at a strange mouse outside of his window. Everytime he goes somewhere, He sees the mouse. Later on , he discovers that it was his friend Kornelius Von Paw! Now Kornelius has grown up and is a secret agent. His sister is one too. Geronimo left his window open in his office the night before and when the morning came, he watched as the wind picked up and envelope with a red seal. so he has to get it before the meeting started.