Sally Ratmousen, known as Sally Rasmaussen in the television series, is one of the main villains of the Geronimo Stilton book and television series. She is the boss of the Daily Rat and is Geronimo's #1 rival. She is determined to prove the Daily Rat is better than the Rodents Gazette. Sally has a cousin called The Shadow. The Shadow is a thief in New Mouse City. In The Mysterious Cheese Thief, she is on the phone with The Shadow, who has stolen from cheese factories, while Geronimo watches. This would imply that Sally may have a criminal record as well or is at least in on the plan.