‘It may help you to think of something peaceful, such as a flower or a formation of clouds.’ He paused, so that the only sounds which could be heard were the deep breathing of the people around the table and the ticking of a clock on the mantelpiece. I heard Vogelmann clear his throat, which prompted Weisthor to speak again.

‘Try and flow into the person next to you so that we may feel the power of the circle. When Otto turns off the light I shall go into trance and permit my body to be taken under the control of spirit. Spirit will control my speech, my every bodily function, so that I shall be in a vulnerable position. Make no sudden noise or interruption. Speak gently if you wish to communicate with spirit, or allow Otto to speak for you.’ He paused again. ‘Otto? The lights, please.’

I heard Rahn stand up as if rousing himself from a deep sleep and creep across the carpet.

‘From now on Weisthor will not speak unless he is under spirit,’ he said. ‘It will be my voice you hear speak to him in trance.’ He turned off the light, and after a few seconds I heard him return to the circle.

I stared hard into the darkness at where Weisthor was sitting, but try as I might, I could see nothing but the strange shapes which play on the back of the retina when it is deprived of light. Whatever Weisthor said about flowers or clouds, I found it helped me to think of the Mauser automatic at my shoulder, and the nice formation of 9mm ammunition in the grip.

The first change that I was aware of was that of his breathing, which became progressively slower and deeper. After a while it was almost undetectable and, but for his grip, which had slackened considerably, I might have said he had disappeared.

Finally he spoke, but it was in a voice that made my flesh creep and my hair prickle.

‘I have a wise king here from long, long ago,’ he said, his grip tightening suddenly. ‘From a time when three suns shone in the northern sky.‘ He uttered a long, sepulchral sigh.’ He suffered a terrible defeat in battle at the hands of Charlemagne and his Christian army.’

‘Were you Saxon?’ Rahn asked quietly.

‘Aye, Saxon. The Franks called them pagans, and put them to death for it. Agonizing deaths, that were full of blood and pain.’ He seemed to hesitate. ‘It’s difficult to say this. He says that blood must be paid for. He says that German paganism is grown strong again, and must be revenged on the Franks and their religion, in the name of the old gods.’ Then he grunted almost as if he had been struck and went quiet again.

‘Don’t be alarmed,’ Rahn murmured. ‘Spirit can leave quite violently sometimes.’

After several minutes, Weisthor spoke again.