‘It was near dark,’ the caller went on. ‘But I saw the whole thing clear. As they came closer it wiz obvious that the fifth man, he wasnae one o’ them. They were holdin’ him by the arms like he was a prisoner. He was fightin’ and strugglin’. Yellin’ at them tae let him go. But the poor guy couldnae get away from them and he never had a chance. They hauled him tae the edge o’ the bank. I couldnae believe my eyes. Didnae want tae watch. Next thing there was a big splash as he hit the water. Two o’ them were carryin’ boat hooks with long metal poles, them telescopic ones. He tried tae drag himself up the bank but the fuckers kept pokin’ him and shovin’ him under. Again and again. Took five, six minutes. Maybe longer. I wanted tae do somethin’ tae help. But I was scared what they’d do tae me. Then when he stopped fightin’ and I could see him floatin’ in the water, they prodded him a few more times tae be sure. I heard one o’ the basturts laugh. Then they turned an’ walked back tae the woods. And that was the last I saw o’ them.’

Ewan couldn’t speak, could barely even breathe. His mind was swirling from much more than a bellyful of booze. Ross, murdered? Was this some kind of crazy dream? Ewan dug his fingernails into his flesh and nipped himself until it hurt, but the caller went on talking.

This was no dream.

‘I could’ve gone tae try an’ pull him from the water,’ the caller said. ‘But I knew he was dead already. I was shocked. Ma heart was thumpin’ so bad, I thought I was gonnae faint. So I just waited until they were gone, and then I legged it. Ran like hell, an’ kept runnin’. I wish I hadnae, but that’s what I did. I just wanted no part o’ it. It wisnae until the next day, when they found the body, that I even knew who they’d murdered. Been frettin’ over it ever since. Cannae shut it oot o’ ma head.’

At last, Ewan was able to marshal his wits together enough to ask the obvious question. ‘These four men. Who were they?’

There was a pause on the line as the caller mulled over his reply. When he spoke again, he sounded scared. ‘I’m sorry, Mr McCulloch. It would be mair than my life’s worth tae tell you another word.’

‘You recognised them, didn’t you?’

Another heavy pause. Then, ‘Two o’ them. That’s all I’ll say.’

‘Please,’ Ewan said. ‘I need to know.’

‘Forget it. I’ve already told you too much. Goodbye.’