Geronimo Stilton, have to travel back in time to save a friend! Professor Paws Von Volt needed his help. He had traveled to the past alone to prove that an artifact in the Egyptian Mouse-um was genuine-and now he was lost in time!His friends and Geronimo boarded the professor's newest time machine to go find him and ended up on a crazy trip through history. He met Cleopatra, Genghis Khan, famous poet Dante, Queen Elizabeth I and more. It was a fabulous journey! But could he find the professor and make it back to the present?