Back at the shop, Willbury suggests that Arthur call Grandfather to give him an update. Willbury and Grandfather hold a convo about what to do next.
Willbury says he'll look up his inventor friend in case that helps them track down the wings at least. Then they talk about cheese hunting, which is illegal, but which might be mixed up with all this business.
Then Willbury asks Grandfather why he lives underground, and Grandfather says he was accused of a crime he didn't commit, so he's had to take refuge there. Arthur wants to learn more, and Grandfather says he'll tell him soon.
Finally, Willbury checks to see whether Grandfather has enough food to last until Arthur gets back. Grandfather thinks he's good on that count, thanks to the rhubarb growing under his bed.