'If you meant to turn up without the formula, you must have expected that he would curse you just the same. And, as you have had no chance to check up on the interior of the house in Cremorne, you'd have had nothing with which to threaten him. So what did you expect to gain by agreeing to this meeting?'

Khune hesitated a second, then his blue eyes suddenly blazed, and he burst out, 'The chance to kill him and get away with it. The odds against my being able to do so in London were too heavy. But, when he demanded that I should meet him down here, I felt that he was playing into my hands. Out there on the moor, I could have done the job and buried the body in some gully. In these Welsh hills it would have been ten thousand to one against anyone finding it in my lifetime, and I'd have been free of him for good and all.'

'I see,' Verney nodded. 'Having read your statement it had occurred to me that when you came face to face with him you might be tempted to adopt drastic measures, or even plan them in advance. Would you tell us now why you changed your mind tonight, and decided instead to confide in Forsby?'

The scientist began to twist his long knobbly-knuckled hands together. 'Because a quick death is too good for the swine. He has always loathed discomfort, poor food, ugly clothes, and physical labour. Even more, to be baulked in his ambitions and condemned to a mind-rotting routine, with only common criminals as companions, would be a foretaste of hell for him. I can't get him a long prison sentence; but you can. That is why I'm here instead of thinking out the most painful way to kill him.'

They all recalled the account Khune had given of the break-up of his marriage, and realized how greatly he must have suffered at his brother's hands; yet, even so, the seething hatred with which he spoke left them silent for a minute. Then Verney said:

'It is essential that he should be caught with some document on him that he has received from you, or at least receive such a document within sight of a witness, even if he throws it away afterwards. I take it you are willing to make out a dud formula, go to the rendezvous, and give it to him?'

'Certainly.'

'Good. We shall draw a cordon round the place and, unless we are very unlucky, catch him within a few minutes of his leaving you. I must say, though, I wish you hadn't chosen such an exposed position as this Lone Tree Hill, because it means that, to keep under cover until the meeting has taken place, Forsby's men will have to take up positions a good half mile away.'