The Sea of Trolls by Nancy Farmer
Paperback – Saga – Jun 2015 – 459 pages
Jack is kidnapped by berserkers from his Saxon village in the year A.D. 793, an occurrence forewarned by his mentor the Bard. Captured by Viking chief Olaf One-Brow, Jack and his sister, Lucy, are swiftly taken to the court of Ivar the Boneless.
Ivar is married to a half-troll named Frith, an evil and unpredictable queen with a strange power over her husband’s court. Jack mistakenly casts a charm on her – and is banished to the kingdom of the trolls to find the magic that will undo the charm. Accompanied by Thorgill, a shield maiden who wants to be a berserker, and by the mysterious crow called Bold Heart, Jack sets out on a harrowing and exciting quest for the ages.