1.2 billion years ago, the far north of Sutherland in Scotland was struck by a meteorite. The wreckage of this cataclysmic event has been almost completely worn away by time, but the rocks in the landscape still bear some traces, which Paul picks through as he embarks on a grand tour from Lairg on Loch Shin to Lochinver and, finally, to the summit of Suilven - the sugarloaf mountain. He then explores some lochs close to Scotland's densely populated central belt. Starting on the banks of the most famous lake in Scotland - the Lake of Menteith - Paul wanders through an enchanting landscape, visiting Loch Ard, Loch Arklet, Loch Katrine and Loch Achray, before climbing a mountain in miniature, Ben Venue.
