Xaxon Yellowbearyd was the fiercest Viking warrior of his time. Now a map to his hidden treasure lies in Radius and Per's hands. Together the cousins must decode the strange numbered grid on the map--and figure out the secret of the Viking's X and Y axes. Full color. While riding through the forests of Angleland, cousins Per and Radius realize they are lost and are desperate for a map to guide them home. Soon they come across a mysterious house in the hills. Inside they find a map to a treasure belonging to Xaxon Yellowbearyd, the fiercest Viking warrior of his time. Per and Radius must decode the strange numbered grid on the map, while trying to steer clear of the pack of bungling bandits who are on their tail. Will they find the treasure in time?