Kate Humble and her Welsh sheepdog Teg continue their journey across the remote Welsh countryside, by exploring Carmarthenshire. In the Cothi Valley, Kate herds and milks goats. In Capel Iwan, Kate tries her hand at trotting. Then in Cwm Elfed, they meet an Englishman keeping the Welsh weaving tradition alive. Near Carmarthen, they see how beavers are transforming a Welsh farm and in Llansteffan, they take to the water, rowing across the Towy estuary to reach the end of their journey.

In north Wales, Kate climbs Wales' tallest man-made structure amidst a storm, and at a natural burial ground, she digs and prepares a grave, discovering how our deaths can help nature.

Kate's sheepdog Teg plays damsel in distress for the South and Mid Wales Cave Rescue Team. Kate uncovers the sad truth of a rare horse breed - the Welsh pony.