Siegfried visits a farm to treat a sick cat and pulls off a brilliant piece of human diagnosis at the same time. He also gets an unexpected visit from the puritan Mr. Hopps -- who does not have an animal with him.

When Lady Hulton's cat falls ill, Siegfried embarks, with typical zeal, on updating the practice to cater for such refined clients. Lady Hulton, however, catches him out at every turn. James' problems lie with an affable but lazy farmer, Vernon Harker, whose plans to save himself from work even extend to marrying a tower of strength with a grown son to match.

Buffoon Stewie Brannen, an old friend of Siegfried's, has invited the distinguished Professor Norton to a black tie dinner, and prevails upon Siegfried to host it at Skeldale -- and lend him a dinner suit. But disaster looms when Siegfried and Stewie are called out for a calving, in full evening dress, and James has to hold the fort with an irascible Mrs. Alton.

Siegfried is determined to discover who shot Korean War veteran Jacob Pearson's dog. The suspect is Captain Crawford's willful and surly 20-year-old son, Hugh -- a young man with problems beyond his pompous father's control. Both James and Siegfried have extraordinarily little success in extracting payment from wily farmer Dennis Pratt -- until they discover he may be sneaking his cows onto a neighboring farm to enjoy better grazing.

Siegfried is laid up at Skeldale with his foot in plaster. His dreams of mouthwatering meals prepared by Mrs. Alton are soon shattered by her regime of a strict diet "for an invalid". Tristan falls for the dark, sad-eyed beauty, Angela Mortimer, Mrs. Pumphrey's great-niece, who has been jilted by her fiance. Fortunately, the demanding dog Tricky-Woo provides an ideal excuse for Tristan to make a number of house calls. James impresses three hero-worshiping locals with his cow-curing abilities, and he learns to value their support when he has to judge the Darrowby Vegetable Show, with disastrous results.