New Mouse City is having a cheese shortage and the residents are after every scrap they can find. It's chaos! Can criminal mastermind, Mouse Caponi, have something to do with this? And who is Marty Mimolette? Geronimo is determined to find out! There is a mysterious cheese shortage in New Mouse City that has everyone in a panic and Geronimo, Thea, Trap and Benjamin are on the case. Who is the elusive, criminal mastermind, Mouse Caponi and what his connection to Marty Mimolette? Read along as the adventure unfolds and find out if Geronimo and his team be able to save the day!