Scottish cult-pop raconteur Aidan Moffat, frontman of indie band Arab Strap - and best known for his no-holds-barred lyrics about sex, drugs and male anxiety - sets out to explore his country's past by rewriting and touring its oldest songs.

It's meant to be a tour that allows Moffat to explore the roots of his country. It's meant to be a trip that celebrates Scotland's communities and lore. But then he meets Sheila Stewart - a 79-year-old force of nature and travelling balladeer whose life, and unexpected death, upturns Moffat's musical assumptions. He believes these old songs are ripe for updating against a modern urban backdrop. She does not. With Sheila's criticism ringing in his ears, the bold Moffat embarks on a trip around Scotland's remote parts that proves to be as uncanny as the Scottish weather. He finds himself caught up in a feud between two monster hunters at Loch Ness, singing to a dismissive Hebridean farmer in his kitchen, and holding court with a mob of ancient warriors in a Highland graveyard.

When Moffat's tour comes full circle, back to his hometown of Glasgow, he ends up in the legendary Barrowland Ballroom: the best loved rock stage in the world, and the setting for an unlikely final showdown, in a funny film about music and death.