Ratho was surrounded by farmland, with the Union Canal bordering it to the north. It was popular in the summer: you could take a boat trip on the canal, or feed the ducks, or eat at a waterfront restaurant. Yet it was less than a mile from the M8, two miles from Turnhouse Airport. Rebus drove out along Calder Road, trusting to his sense of direction. Fergus McLure’s house was on Hallcroft Park. He knew he could find it: there were only a dozen streets in the whole village. McLure was known to work from home. Rebus had decided against phoning ahead: he didn’t want Fergie forewarned.

When he reached Ratho, it took him five minutes to locate Hallcroft Park. He found Fergie’s address, stopped the car, and walked up to the door. There was no sign of life. He rang the bell a second time. Net curtains stopped him peering through the window.

‘Should have phoned,’ Rebus muttered.

A woman was walking past, terrier straining on its leash. The small dog made terrible choking sounds as it sniffed the pavement.

‘Is he not in?’ she asked.

‘No.’

‘Funny, his car’s here.’ She had time to nod in the direction of a parked Volvo before the dog hauled her away. It was a blue 940 estate. Rebus looked in through the windows, but all he saw was how clean the interior looked. He checked the mileage: low. A new car. The tyre-walls hadn’t even had time to lose their shine.

Rebus got back into his own car – mileage to date fifty times the Volvo’s – and decided to head back into town by the Glasgow Road. But as he made to drive over the canal bridge, he saw a police car at the far end of the restaurant car park, sitting on the slip-road down to the canal. There was an ambulance parked next to it. Rebus braked, reversed, and turned into the car park, crawling towards the scene. A woolly suit came to warn him off, but Rebus had his warrant card ready. He parked and got out.

‘What is it?’ he asked.

‘Somebody went for a dip with their clothes on.’

The constable followed Rebus down to the jetty. There were cruise boats moored there, and a couple of tourist-types who looked like they’d come for a trip on one of them. The rain had started again, pockmarking the surface of the canal. The ducks were keeping their distance. A body had been hauled out of the water, clothes sodden, and laid on the wooden slats that constituted the jetty. A man who looked like a doctor was checking for signs of life, no real hope in his face. The back door to the restaurant was open, staff members standing there, faces interested but full of horror.

The doctor shook his head. One of the tourists, a woman, began to cry. Her companion, a man, cradled his video camera and put an arm around her.

‘He must’ve slipped and fallen in,’ someone said, ‘banged his head.’