After Jack becomes apprenticed to a Druid bard, he and his little sister Lucy are captured by Viking Berserkers and taken to the home of King Ivar the Boneless and his half-troll queen, leading Jack to undertake a vital quest to Jotunheim, home of the trolls. Jack was eleven when the berserkers loomed out of the fog and nabbed him. "It seems that things are stirring across the water, " the Bard had warned. "Ships are being built, swords are being...