A trip to the library causes Potter to catch the bus and it "savages" his umbrella. To make matters worse, his sister, Harriet, is staying the night with her artist husband, Willy. They have parked their caravanette on the drive and Potter doesn't trust it.

Another busy day for Potter as he tries to adjust to his new life of retirement. Now he has time to help others with problems they didn't know they'd got.