Geronimo Stilton and his friends travel to Mainz, Germany, in the year 1455, to interfere with Tersilla of Catatonia and the Pirate Cats' plans to steal the type from Johannes Gutenberg's original printing press and become the first in history to use movable type.

"Japan, 1603, Geronimo and his friends don't know why the pirate cats went back to this precise point in time, but they are sure the pirate cats are up to no good! Posing as a traveling troupe of actors, Geronimo somehow manages to convince he locals that he's really a shogun, and not the first samurai! Will Geronimo be able to uncover the pirate cat's plan in time to stop them? Or have the pirate cats finally won?"--From the publisher.