'It was an old Georgian mansion with a high wall all round it, except for its front; and there it faced on to a semi-private courtyard. But it was in the heart of a slum district. That's all I can tell you.'

'That doesn't get us far. In a great area like London there must be dozens of derelict places like that in districts that have gradually deteriorated into slums.'

'Oh, but it wasn't derelict. Inside it was beautifully decorated, and furnished in keeping with its period.'

'That doesn't surprise me. Those sort of crooks have oodles of money. What happened after you arrived there?'

For a second Mary hesitated. She had not forgotten Ratnadatta's threat that he and his friends would know about it if she betrayed their secrets, and take steps to exact a grim penalty. But now that she had made up her mind to break with them, and would soon have lost touch with him altogether, she felt that she need no longer take serious notice of his threat. Besides, she was thoroughly enjoying Barney's reactions to the dangers she had courted and was tempted by the urge to see him becoming more wrought up on her account.

'Well,' she said, 'if I do tell you I must ask you to keep it to yourself. You see, I'm not supposed to speak about these people's doings to anyone, and if it leaked out that I had they might make trouble for me.'

'I fully appreciate that,' he nodded. 'So the last thing you need be afraid of is that I'd let you down.'

'All right then. He took me up to a gallery where without being seen we could look down on the interior of the temple. There were about thirty men and women in it, all masked and wearing only gossamer-thin cloaks, through which one could see absolutely everything.'

Barney's face had become grim, and he muttered, 'That's more or less the kind of form I expected. But, damn it all, Margot! You mustn't let yourself get involved further in this sort of thing. You really mustn't!'

'I don't know.' She gave a shrug that implied sophisticated detachment. 'I haven't yet quite made up my mind. I wouldn't have missed this show last night for anything. By comparison, the sort of things one sees at Mrs. Wardeel's are child's play. Ratnadatta and his friends really can call down power, and I'm awfully tempted to go with him again next Saturday. It depends on whether I can screw up my courage to go through the initiation ceremony.'

'What form does it take? Something pretty beastly, I bet.'

'Not necessarily. But once in, I might be expected to take part in the, er - social activities of the Brotherhood.'

'I don't quite get you?'

'Well, Ratnadatta let me watch them do their serious stuff, but then he said that I'd seen quite enough for a first visit. Just as we were leaving they were about to sit down to a feast, and I've rather uneasy suspicions about the kind of fun and games they may have got up to afterwards.'