1st Atheneum Books for Young Readers pbk. ed. - New York : Atheneum Books for Young Readers, 2010, c2004.
459 p. : ill., maps ; 21 cm.
"A Richard Jackson book."
Includes bibliographical references (p. -459).
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.