Carey shook his head. ‘It was more than that. The dag that killed him must have been right up behind him, close, perhaps less than a foot away. Would you let your enemy get so close to you with a loaded dag?’

Jock thought about it. ‘I wouldnae,’ he said finally, ‘if he’s that close, you’ve a chance of knocking it away or hitting him before the gun can fire, and if he’s waving a dag at ye, it’s worth a try because he’s going to kill ye anyway.’

‘Precisely,’ said Carey pedantically, ‘no gun ever fires instantly: if it’s got a powder pan, the flash has to go down into the gun, if it’s got a lock, the mechanism has to unwind to make the sparks. Sweetmilk knew that as well as anybody.’

Jock nodded slowly. ‘Ye’re saying, he let whoever killed him come up close because he wasnae an enemy, he was a friend.’

‘Exactly. Or at least someone he knew and had no reason to fear right then.’

Jock nodded again. ‘Go on, Courtier.’

Carey peered over the parapet again and saw men hurrying about with lighted torches and faggots of wood. He shot at them, and got one through the leg. He stayed there with his bow, wishing he was a better shot, peering over the parapet and trying to think himself into Bothwell’s mind.

‘He’d been robbed by the time we got the body.’

‘Yes, that was one of Dodd’s men. I have the jewels and rings in Carlisle and I’ll send them back to you when I can.’ He coughed. ‘If I can.’

‘Wasna robbed, eh? He was wearing some good stuff.’

‘I know. So why was he killed? It wasn’t a fight, it wasn’t to steal his jewels, or even his horse.’

‘Ah, the horse. I should have known the beauty would be trouble.’

‘There’s a reason why I don’t think he was killed for the horse, but I’ll come to it. The next point is where the killer left the body. Solway Moss, in a gorse bush.’

‘Maybe that’s where he was killed?’

Whatever else he was, Jock was not stupid. ‘The man didna know of a better place or couldna reach it in the time,’ he said. ‘He’s a stranger to this country.’

‘And Daniel Swanders saw someone when he stole Caspar,’ said Carey. ‘He saw a man in a rich doublet, cleaning a jack, and what’s more, the man didn’t chase after him either so Caspar wasn’t the reason for the...’

‘A rich doublet,’ repeated Jock.

‘So,’ said Carey, counting off on his fingers in a way he had picked up wholesale from Walsingham, ‘we have signs and portents of the murderer. He was well-known to Sweetmilk so he could get up close behind him with a loaded dag, he was rich, he was a stranger to these parts...’

‘Good God Almighty,’ said Jock, putting his head back against the wooden post, ‘I’ve been sitting down to eat with my son’s killer for this past week.’

‘It has to be, doesn’t it?’ said Carey. ‘It has to be the Earl or one of his men.’

‘But why...?’

‘I don’t know,’ said Carey, but he couldn’t hide the expression on his face well enough for Jock.

‘Ye do know.’

‘I don’t.’

‘Ay, ye do,’ said Jock, ‘and ye’ll tell it me, if you’ve gone this far.’ He laughed mirthlessly. ‘Who knows, it could even get you out of this alive.’

‘Don’t lie to me, Jock.’

‘Well, it could get you a quicker death, any road. Come on.’

‘Whoever killed Sweetmilk is the father of your daughter Mary’s bairn.’

‘Her what?’ Jock’s eyes were glaring with fury and he struggled against the ropes holding him. ‘WHAT did you say?’

‘Your daughter Mary is expecting a babe around Christmas time. Bothwell, or one of his men, is the father.’ Jock’s face was swollen, he seemed to be choking. Carey, who knew perfectly well he was talking for his life, but was a natural gambler, carried on remorselessly. ‘My thinking is that Sweetmilk found out what had happened to his sister, and challenged the man to a duel. They went off away from Carlisle to fight it out, so Mary wouldn’t be shamed by it, and while they were on their way, the man came up behind Sweetmilk when he wasn’t expecting it, and shot him. Then he abandoned him at the only place he could think of and came back.’

There were tears flowing down Jock’s crusty face. ‘God damn him, God damn him to hell, poor Sweetmilk, I’ll skelp the little bitch, I’ll...’

‘You’ll marry her off quickly is what you’ll do. I think she might have been forced.’

‘What do you know about it?’

‘I’ve talked to her and I don’t think she was willing.’ Carey, knowing what he did of the Queen’s maids of honour, thought she’d probably been perfectly willing at the time, but felt sorry for her. ‘At best, he persuaded her against her better judgement. At worst he raped her.’

‘God, so that’s what’s been ailing her. Why didn’t she tell me when Sweetmilk was killed?’

‘Afraid of you. Afraid of the man, perhaps he threatened her. Perhaps she still had a liking for him. Who knows?’

Jock shook his head, snorted violently against his running nose. ‘How can I find the man?’

‘Well, I’ve done a lot of the work,’ said Carey reasonably, ‘I’ve narrowed it down from most of the population of the March to Bothwell or one of his men. And I hate to admit it, but I don’t think it was Bothwell either.’

‘Why not?’

‘Mary said she wouldn’t marry the father if he was the Earl himself, so I think he wasn’t. It’s not that Bothwell wouldn’t do it, but I don’t think he did on this occasion. So you’ve got three or four possible murderers to choose from.’

‘I suppose it would be wasteful to shoot all of them and be done with it,’ said Jock thoughtfully. ‘And it might be a little tickle to do at that. So, how do I find out which one to kill?’

‘Who was at Netherby on the Saturday? Who did Sweetmilk ride out with? Who came back?’

‘Ah,’ said Jock, wriggling his shoulders against the wood. ‘Let me think.’ If his arms were cramping him, he didn’t say anything about it, and Carey wouldn’t have risked untying him anyway. He was a grizzled old bastard and tough as doornails, he could suffer.

Carey’s belly started rumbling again. It was dinner time and nothing to eat but raw pigeon squabs from the little dovecote on the south-western corner. Well, he wasn’t that hungry yet. Or perhaps he could light a little fire with the materials for the beacon and roast them.

There was a stealthy clatter on the other side of the roof. Jock didn’t seem to have heard, but Carey knew if he’d been a horse, his ears would have swivelled.

He picked up one of the long hardwood poles used for poking the beacon and crept round to the opposite parapet. When he peered over, he saw that the ladder they were trying to use was too short, but that the man climbing it had a caliver under his arm, with the slowmatch lit.

‘Halfwits,’ said Carey again, under his breath, ‘haven’t any of you heard of Pythagoras?’

Very carefully, while the man was still halfway up, he reached with his pole over the wall, hooked it into the top rung of the ladder and pushed. There was a scream, a bang from the caliver, a loud crash and clatter. Carey went back to where Jock was and offered him some water, which Jock drank. Neither of them commented on the ladder.

‘Ye canna win,’ said Jock, ‘ye canna hold out indefinitely. Sooner or later ye must sleep.’

‘Oh, it’ll be quicker than that,’ said Carey, ‘sooner or later they’ll work out how to do it.’