After that, there was no reason for her to stay. She rode out as she had come, with a great retinue following behind, and all the court bowing as low as they could reach, to indicate their new-found loyalty; half of them praying silently that, when the young king died and she came to the throne, she would be blessed with forgetfulness and overlook the priests they had burned at the stake, and the churches they had despoiled.

I was watching this charade of humility from one of the palace windows when I felt a gentle touch on my sleeve. I turned, and there was Lord Robert, smiling down at me.

‘My lord, I thought you would be with your father, saying goodbye to the Lady Mary.’

‘No, I came to find you.’

‘For me?’

‘To ask you if you would do me a service?’

I felt my colour rise to my cheeks. ‘Anything . . .’ I stammered.

He smiled. ‘Just one small thing. Would you come with me to my tutor’s rooms, and see if you can assist him in one of his experiments?’

I nodded and Lord Robert took my hand and, drawing it into the crook of his arm, led me to the Northumberland private quarters. The great doors were guarded by Northumberland men, and as soon as they saw the favoured son of the house they snapped to attention and swung the double doors open. The great hall beyond was deserted, the retainers and the Northumberland court were in the Whitehall garden demonstrating their immense respect to the departing Lady Mary. Lord Robert led me up the grand stairs, through a gallery, to his own rooms. John Dee was seated in the library overlooking an inner garden.

He raised his head as we came into the room. ‘Ah, Hannah Verde.’

It was so odd for me to hear my real name, given in full, that for a moment I did not respond, and then I dipped a little bow. ‘Yes, sir.’

‘She says she will help. But I have not told her what you want,’ Lord Robert said.

Mr Dee rose from the table. ‘I have a special mirror,’ he said. ‘I think it possible that, one with special sight might see rays of light that are not visible to the ordinary eye, d’you understand?’

I did not.

‘Just as we cannot see a sound or a scent, but we know that something is there, I think it possible that the planets and the angels send out rays of light, which we might see if we had the right glass to see them in.’

‘Oh,’ I said blankly.

The tutor broke off with a smile. ‘No matter. You need not understand me. I was only thinking that since you saw the angel Uriel that day, you might see such rays in this mirror.’

‘I don’t mind looking, if Lord Robert wishes it,’ I volunteered.

He nodded. ‘I have it ready. Come in.’ He led the way to an inner chamber. The window was shielded by a thick curtain, all the cold winter light blocked out. A square table was placed before it, the four legs standing on four wax seals. On top of the table was an extraordinary mirror of great beauty, a gold-wrought frame, a bevelled rim, and a golden sheen on the silvering. I stepped up to it and saw myself, reflected in gold, looking not like the boy-girl I was, but like a young woman. For a moment I thought I saw my mother looking back at me, her lovely smile and that gesture when she turned her head. ‘Oh!’ I exclaimed.