The Pirate Cats, led by Tersilla of Catatonia, are hitting Geronimo Stilton where he lives! They have travelled back in time in order to steal Johannes Gutenberg's original printing press! What mad scheme do the Pirate Cats have for the Purr-Ioined presses? Geronimo Stilton and his friends intend to find out when they travel to the city of Mainz, Germany in the year 1455 to stop the Pirate Cats from tampering with history!