Kinlochardaich had a church, a pub, a garage, a small convenience store and its own tiny primary school with about twenty-five pupils, but it had no police station – something many residents regarded as a blessing. The only cop hereabouts was Grace Kirk, and so Ewan clambered into his van and drove hurriedly over to the rented cottage in which she lived alone, just beyond the outskirts of the village. He was a little nervous about going to see her. They hadn’t been alone together since they were both sixteen years old and sort of, kind of, on-and-off going out. Not that it had been much of a relationship. A bit of hand-holding, a few awkward kisses and some sweet talk, nothing more serious. But Ewan had secretly worshipped and pined for Grace for years afterwards, and in fact was willing to admit to himself that he’d never quite got over her. The news of her return to Kinlochardaich a few months back had got him rather worked up, though he’d never had the courage to speak to her, let alone ask her out again. The local gossip mill had it that she and Lewis Gourlay, a regular of the drinking fraternity at the Arms, were an item. Ewan stubbornly refused to believe the rumour.

In the event, he needn’t have felt nervous because Grace wasn’t at home. Ewan’s remaining option was now to drive the thirty miles south-east to Fort William, the nearest town of any real size, and talk to the police there. The journey took an hour, thanks to the narrow and winding roads.

The police station was a generic slab-sided office building located out of town near Loch Eil, with misty hills looming in the background. On arrival Ewan blurted out his story as best he could to a duty officer, who became thoroughly confused, asked him to calm down and showed him into an airless, windowless interview room with a plain table and four plastic chairs. Locked in the room and made to wait, Ewan felt strangely like he was under arrest. The beady eye of a video camera watched from one corner.

Half an hour later, the door opened and in walked two middle-aged plainclothes men who introduced themselves as Detective Inspector Fergus Macleod and Detective Sergeant Jim Coull. Macleod was a large burly man with a neck like an Aberdeen Angus bull and a florid complexion, and Coull was a smaller sandy-haired guy with a brush moustache, lean and whippy in build, whose hands never stopped moving. They sat at the table and asked him to run through the account he’d told the duty officer.

Ewan patiently laid the whole thing out to them in detail. They listened gravely and Coull scratched occasional notes on a pad he kept close to his chest. When Ewan reached the part about the coins, the detectives asked if they could see them.