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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.
By Geronimo Stilton
TM & (c) 2018 Scholastic Inc. All Rights Reserved.
TM＆（c）2018 Scholastic Inc.すべての権利を保有します。
TM & (c) 2018 Scholastic Inc. 판권 소유.
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