Picture a mouse on the back of a falcon soaring over a castle. Imagine that mouse practicing jousting using a squirrel as his horse or storming through the corridors of Camelot with a cat and dozens of knights chasing him. Glimpse into Merlin's cottage as the mouse rummages through the wizard's spell books to learn a magic potion. If it weren't for that mouse King Arthur would never have pulled the sword from the stone.

"Otter and Arthur and the Sword in the Stone" follows the adventures of a mouse nicknamed Otter who befriends a boy named Arthur and helps him become literature's most...