Tom and Barbara acquire two piglets, promptly christened Pinky and Perky by Barbara. Settled into their own sty in the Goods' back garden, it is not long before Margo lodges a complaint, declaring that pigs are dirty, messy creatures.
To back up her assertions Margo calls in a local council member, but is astonished when he sides with the Goods. Pinky and Perky are allowed to stay, but only on condition that they do not stray into Margo's garden.
Disaster strikes when Pinky and Perky tunnel out of their sty and graze in Margo's arbor among the concrete toad stools.