The polar bear is a royal bear, a gift from the King of Norway to the King of England. The first time Arthur encounters the bear, he is shoved in her cage as payback for stealing food. Restless and deadly, the bear terrifies him. Yet, strangely, she doesn't harm him--though she has attacked anyone else who comes near. That makes Arthur valuable to the doctor in charge of getting the bear safely to London. So Arthur, who has run away from home, finds himself taking care of a polar bear on a ship to England.

Tasked with feeding and cleaning up after the bear, Arthur's fears slowly lessen as he begins to feel a connection to this bear, who like him, has been cut off from her family. But the journey holds many dangers, and Arthur knows his own freedom--perhaps even his life--depends on keeping the bear from harm. When pirates attack and the ship founders, Arthur must make a choice--does he do everything he can to save himself, or does he help the bear to find freedom?

Based on the real story of a polar bear that lived in the Tower of London, this timeless adventure story is also a touching account of the bond between a boy and a bear.