The comedian traverses the North Coast 500, a 500-mile trip around the northernmost parts of mainland Britain. Beginning in the village of Golspie, Susan travels round the coast to Dunrobin Castle. There, she sees the 189-room property's clock tower inspired by Big Ben, as well as its very own private train station. Further up the coast, Susan visits the Whaligoe steps, stunningly carved into the dramatic landscape, before getting a taste of the work of a real-life `herring girl". After stopping off at John O' Groats, the presenter heads to Dunnet Head for a spot of puffin-watching.