It’s spring in 1938, and a trip back home to Glasgow presents James Herriot with a dilemma that will mean choosing between the people he loves when he is offered a position at his old mentor's forward-thinking practice.

With Tristan's encouragement, James asks Helen if she'd like to go to the local spring dance. But village resident Gerald's arrival with his injured dog, Rock, puts a spanner in the works. Meanwhile, Tristan worries that Siegfried is in danger of losing his edge.

The fate of a struggling young widow causes difficulties for James and Helen's burgeoning romance. Meanwhile, Siegfried has another scheme to whip Tristan into shape, and a visit from Tricki Woo causes chaos in Skeldale House.

It's an important day for Tristan in more ways than one, as he celebrates his birthday and Siegfried gives him new responsibilities as a vet. Tristan has to withstand the pressure and succeed in the challenge set by his older brother before returning to Skeldale for his birthday festivities. Meanwhile, Mrs Hall reminds James that he needs to tell Helen some home truths.

When a familiar face from Helen's past returns to Darrowby, James worries that he has to vie for her attention and steps up to compete against them at Mrs Pumphrey's annual cricket match. The rest of Skeldale House are apprehensive as the game can be brutal. Siegfried tries his best to train James and get a reluctant Tristan to step in, but it's not looking good for their Darrowby Eleven team.

James and Helen spend their first Christmas together, but must agree on where to spend it. Despite all seeming idyllic, the vets are troubled as Tricki Woo is sick.