Author(s): Geronimo Stilton
Timeless cheese sticks! Professor Maximilian Mousemover just arrived in Muskrat City... in a time machine! Tony Sludge's great-great-grandfather Butch Sludge is visiting from the past, too, and he's up to no good. The Heromice must travel through time to save the rodents of the past-and the future-from the Sewer Rats.