Can scaredy-mouse Geronimo Stiltonord survive in the age of Vikings and dragons?

Geronimo Stiltonord has been selected to judge the Shield Mouselet Mega Challenge, a competition of female miceking warriors. But all the contestants are so good, it's impossible to choose just one winner! Even worse, since everyone is distracted by the challenge, the dragons launch a surprise attack! Will the micekings be able to defend their home?