Can scaredy-mouse Geronimo Stiltonord survive in the age of Vikings and dragons? The micekings have received a mysterious message in a bottle! Unfortunately, most of it has been damaged by water -- but Geronimo can tell it's from the Oofa Oofas, the laziest rodents in the ancient far north. The micekings set sail to Oofadale, in case the Oofa Oofas are in trouble. But on their way, the dragons attack! Fjords and fiddlesticks, what an adventure!