Harrow and Arty are hares and first season Border Patrollers. Their warren is within a large city.

On a cool winter evening, on patrol, Harrow and Arty discover that humans have built something terrible. A massive fence has been built around the Eastside Warren's vegetable gardens. Long ago the Eastside Warren claimed these gardens as their own and each summer the hares gather enough food for the upcoming winter. This fence has been built with one purpose...and that purpose is to keep hares out!

The young patrollers soon find them selves on a dangerous mission. Accompanied by a senior patroller, the three hares are sent to enlist the help of the Big River Beavers who live far to the west, across the inner city.

This senior patroller, however, has plans of her own. The mission may be doomed before it even has a chance.