When rich American hotelier Alice Wenger arrives in Kinloch, some eyebrows are raised and memories are rekindled. Meanwhile, the secretive Doig family live a solitary existence on a remote part of the Kintyre peninsula, without even the basic amenities of modern life.

After the family's patriarch plummets to his death, secrets of stolen gold, whisky smuggling, shipwrecks and brutal events going back decades begin to emerge.

With emotions running high in Kinloch Police Office, the team must put aside their own problems and get to the bottom of a sickening crime.