District Nurse Megan gets a call to a small South Wales town in the mid 1920's, to investigate a virulent epidemic.

The district nurse is convinced that whatever is causing the epidemic is being carried in the town's water-supply. But how can she prove it in time....?

Megan ventures to the farm. apprehensive that Shamps might take another pot shot at her, and finds her nursing skills needed in an unexpected way ... The results of the water tests come through. And the district nurse is summoned to face an angry charity committee ...

discovers that the local children have contracted horrible head lice.

Megan gets attacked in the street by the parents of nit-infested kids, and tends a local who is sick with pneumonia

Megan has to deal with a complicated pregnancy in a remote cottage...all alone.

Megan is convinced two of her patients are lying about their injuries, and Megan has a strange and worrying conversation with young Nora.

Megan finds that proving why young Nora mysteriously died is near impossible.

Megan travels up to North Wales to visit lovely Mrs. Pughe-Morgan.

Megan moves into Gwen and David's cottage, causing nasty tongues to start wagging. Megan decides to join the local brass band.

Gwen gets threatened with eviction unless District Nurse Megan moves out of the cottage. The school outing to the seaside ends in a disastrous encounter with some sheep.

The charabanc, full of children, has crashed on the mountainside. This forces the people of the town to look at themselves in a new light. What do they really want for their community? And where will Megan, the district nurse, fit into their scheme of things .. ?