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.