What begins as a relaxing vacation turns into a time-traveling adventure, where Geronimo Stilton must travel to Khanbalik, or "The City of Khan" (modern day Beijing) in 13th Century China where he encounters Kublai Khan and Marco Polo. This time, Geronimo and friends must stop the Pirate Cats from corrupting Marco Polo's famous book "The Travels of Marco Polo," and changing history forever!
"In this adventure, Geronimo has to face his worst enemies, the Pirate Cats, who have discovered a way to travel back in time and change history ... they want to change the face of the Great Sphinx into a cat's face! Can they possibly trick the pharaoh Chephren into making this happen? And how can Geronimo Stilton possibly stop them?"--P.  of cover.
This time, Bonzo and his devious cohorts travel to Rome, Italy in the year 80 AD to the opening of the Coliseum, Rome's largest amphitheatre. The first part of the evil felines' sinister scheme requires them to infiltrate the Senate by posing as nobility.