only one person who can save them.With some difficulty, they kidnap Siri and Zack and bring them back to Paris, where Siri is presented to a skeptical Rollie. Can a little kid really help the savage Vikings?Now Siri has to pretend to assist Rollie while secretly finding ways to protect the denizens of Paris from the Vikings´attacks. Her task grows more impossible with each passing day, until she and Zack suddenly receive help from an unexpected sourse.