Isaiah, a rogue Templar agent, has discovered both the faith prong and the fear prong of the powerful Trident of Eden relic. Should he possess the devotion prong, there is little that can stop him from destroying the world. Owen and his fellow teens have established an uneasy alliance across Assassin and Templar lines in order to stop Isaiah while they still can. They discover that it is on Viking battlefields that the secrets of the devotion prong lie. The actions they take will change the world of Assassin's Creed forever.