'I don't really know. Teddy used to talk in his sleep. He never gave away any office secrets, and mostly it was incoherent muttering. But during the last few weeks he began to have nightmares. He seemed to be struggling in a sort of medieval hell. He raved about the Devil taking the form of a small black imp, and of a Temple where animals were sacrificed. An Indian was mixed up in it, and someone whom he referred to as "the Master". When he woke from these nightmares, or I woke him, he was drenched in sweat. But he wouldn't tell me their cause. He used to shrug them off by saying that he was making a study of the occult and had been reading a lot about the bad side of it.'

'That may have been true. On the other hand, one can't rule out the possibility that he had got in with some bad hats at these séances and that they introduced him into a Black Magic circle.'

'That's what I think.'

'And you intend to follow this up?'

'Yes.'

For a moment C.B. was silent. All she had said fitted in so well with his own theory of what lay behind Morden's death that he was greatly tempted to tell her to go ahead. Yet few people knew better than he did the terrible danger to which she would be exposing herself if she did. Having decided that he must do his best to stop her, he said:

'Listen, lady. In my work I've been up against this sort of thing before;[2] yet I've never succeeded in bringing a big Black to justice. They are incredibly cunning and utterly unscrupulous. If I, with all the resources of my department, can't get the goods on them, how can you, a woman working on her own, hope to? Supposing you are right, you'll get no further than the fringe of it; then they'll catch you out, and the odds are that you'll end up as poor Teddy did. It isn't on! You've got to put this idea right out of your head.'

She gave a slight shrug. 'Of course there's a risk. I know that. But in my case I think you exaggerate. If these people did kill Teddy, it must have been because one of them found out that he was working for you. As you have turned me down that could not apply to me. Anyway, I'm a free agent, and, if I choose to do this, you can't stop me.'

'No, I can't. But I can give you some idea of the sort of situation you will be faced with from the very start.'

'I'd be interested to hear it.'