When Mayor Madison wants to save an old historic house that is dangerously close to a crumbling cliff, Bob and the team lift it onto Two-Tonne’s flatbed to take it to a new site. Mr. Bentley accompanies the convoy and, being a keen bird watcher, he spots a nest of very rare eggs by the side of the road. To avoid disturbing it, Two-Tonne decides to take a different route through the city, but he misjudges the height of the bridge and the house gets stuck. Luckily Bob has a solution! He lets the air out of Two Tonne’s tires so the vehicle becomes low enough to squeeze under the bridge and move to the new site.