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Robert pleads with Megan to leave Trefelin with him, but it's down to Prem to discover the real truth about his past. Dan helps Kamini find out the real story behind Basil's plans for the new Trefelin, leading Prem to confront him about the brothers' real reason for returning home.

Basil's continuing drive for villagers to exchange their deeds for new houses is reaping great results, and a visit to Sian's shop suggests he may be in for an unexpected investment from an unlikely source. Robert takes advantage of Emlyn's absence by taking Megan for a drive... a drive, he hopes, might rekindle their teenage romance. Below ground, the trapped men each battle with their demons, and when their situation takes an even more serious turn, their lives are left in the balance.

Sian decides that farmer Ceri might be worth ensnaring with her feminine charms - at least if he really has come into some unexpected money - and Robert is doing his best to woo his old girlfriend Megan, much to Emlyn's alarm. The Dawkins are not the only couple to fall out, as Prem confronts Kamini over a job offer from Basil. Prem's anger is cut short, however, when he discovers that, against his advice, Owen has gone back to work at the mine - with disastrous results.

As the suave doctor Robert renews his acquaintance with childhood sweetheart Megan, older brother Basil ingratiates himself with villagers eager to exchange their house deeds as a deposit on a swanky house in his new development. Aled and Daf clumsily conjure an ambitious plan to end Basil's ambitions; Robert, meanwhile, surprises Prem by offering him a central role as part of his new medical centre team. But Prem has a more immediate problem when, late in the day, a forlorn Megan calls at the surgery with some unexpected news.

Trefelin, the sleepy Welsh Valleys town in which Prem set up practice three years ago, is rudely awoken by the throaty roar of an American sports car carrying returning prodigals Basil and Robert Thomas, sons of the erstwhile local mine owner. The brothers are greeted enthusiastically by the villagers, buying drinks for all-comers and inviting everyone to their homecoming party. Basil and Robert's return to their former home also dashes Kamini's hopes of moving into the house of her dreams. Bumbling revolutionaries Aled and Daf seek a cause to protest. But it's the Thomas brothers' announcement of their grand plans for Trefelin that seem more likely to really rock village life, and cast a shadow over Prem's future.