Geronimo Stilton SE Journey Through Time #6: The Test of Time [Hardcover] Stilton, Geronimo

Geronimo travels through time once again to return tops the Triceratops, Helen of Troy, Attila the hun, Charlemagne and Christopher Columbus to their proper time periods. But Geronimo and his friends aren't sure Professor von volt's new machine works perfectly. Will they make it back