The Adventures of Peter Wheat #46

Peter and Beetle discover an old map in a mole's underground cavern that leads to hidden treasure, which they successfully locate despite the mole's regret at never collecting it himself. When the Grand Wizard learns of the treasure's existence, he attempts to capture it and invade the Wheat Kingdom, prompting Peter and his allies to prepare their defenses at the Tree Castle. After the Grand Wizard's forces are defeated by a magical fishnet trap set by the kingdom's defenders, the wizard and his minions are captured, and Peter's companions vow never to disobey orders again.