On this Grand Tour, Paul discovers the strategic wartime importance of Loch Ryan and meets a man whose memory of those days is tinged with tragedy. In Stranraer, Paul discovers a legacy of Arctic exploration and an old can of bully beef, then meets a clan chief who tends a unique garden surrounded by two lochs. Reliving the days of steam trains, Paul walks the old railway line towards Loch Ken, where a monster lurks beneath the waters. On the banks of Loch Trool, he discovers some rocky evidence of Bruce's victory over the English in 1307, and then climbs the highest mountain south of Ben Lomond - the mighty Merrick.

In the final episode of the series, Paul visits Kintyre and encounters a strange and spiritual cave painting on Davaar Island, before sampling spirits of another kind in Campbeltown, famous the world over for whisky. This leads him to uncover the story of the only coal mine in the Highlands and a seam that runs all the way to Ireland. Heading up Loch Fyne, Paul joins the last of the Ring Net fishermen onboard a restored fishing boat heading to Lochgilphead, where he tracks down the inventor of Scotland's lost supercar - the Argyll Turbo. Journey's end is in the middle of Loch Fyne on a truly remarkable relic of the Ice Age.

In the first programme of the series, Paul visits Wester Ross and discovers the heritage of Little Loch Broom. He then travels to the off-grid community of Scoraig where he learns about violin making and wind power, before taking the plunge to explore the hidden depths of the Corrieshalloch Gorge. In Ullapool, on the shores of Loch Broom, Paul learns the Russian word for parsley and how a huge fleet of Russian fish factory ships known as Klondykers used to visit the town. He then follows a red herring that connects the lochs of the west coast to the history of the slave trade. Journey's end is on the rocky summit of Stac Pollaidh.