ONE

      On a horse borrowed from the French ambassador to the court of Queen Elizabeth of England, I rode out across London Bridge on the morning of 20th May 1583. The sun was strong already, though it was not yet noon; diamonds of light scattered across the ruffled surface of the wide Thames and a warm breeze lifted my hair away from my face, carrying with it the sewer stinks of the river. My heart swelled with anticipation as I reached the south bank and turned right along the river towards Winchester House, where I would meet the royal party to embark upon our journey to the renowned University of Oxford.

      The palace of the bishops of Winchester was built of red brick in the English style around a courtyard, its roof decorated with ornate chimneys over the great hall with its rows of tall perpendicular windows facing the river. In front of this a lawn sloped down to a large wharf and landing place where I now saw, as I approached, a colourful spectacle of people thronging the grass. Snatches of tunes carried through the air as musicians rehearsed, and half of London society appeared to have turned out in its best clothes to watch the pageant in the spring sunshine. By the steps, servants were making ready a grand boat, decked out with rich silk hangings and cushions tapestried in red and gold. At the front were seats for eight oarsmen, and at the back an elaborate embroidered canopy sheltered the seats. Jewel-coloured banners rippled in the light wind, catching the sunlight.

      I dismounted, and a servant came to hold the horse while I walked towards the house, eyed suspiciously by various finely dressed gentlemen as we passed. Suddenly I felt a fist land between my shoulder blades, almost knocking me to the ground.

      ‘Giordano Bruno, you old dog! Have they not burned you yet?’

      Recovering my balance, I spun around to see Philip Sidney standing there grinning from ear to ear, his arms wide, legs planted firmly astride, his hair still styled in that peculiar quiff that stuck up at the front like a schoolboy hastened out of bed. Sidney, the aristocratic soldier-poet I had met in Padua as I fled through Italy.

      ‘They’d have to catch me first, Philip,’ I said, smiling broadly at the sight of him.

      ‘It’s Sir Philip to you, you churl – I’ve been knighted this year, you know.’

      ‘Excellent! Does that mean you’ll acquire some manners?’

      He threw his arms around me then and thumped me heartily on the back again. Ours was a curious friendship, I reflected, catching my breath and embracing him in return. Our backgrounds could not have been more different – Sidney was born into one of the first families of the English court, as he had never tired of reminding me – but in Padua we had immediately discovered the gift of making one another laugh, a rare and welcome thing in that earnest and often sombre place. Even now, after six years, I felt no awkwardness in his company; straight away we had fallen into our old custom of affectionate baiting.

      ‘Come, Bruno,’ Sidney said, putting an arm around my shoulders and leading me down the lawn towards the river. ‘By God, it is a fine thing to see you again. This royal visitation to Oxford would have been intolerable without your company. Have you heard of this Polish prince?’

      I shook my head. Sidney rolled his eyes.

      ‘Well, you will meet him soon enough. The Palatine Albert Laski – a Polish dignitary with too much money and too few responsibilities, who consequently spends his time making a nuisance of himself around the courts of Europe. He was supposed to travel from here to Paris, but King Henri of France refuses to allow him into the country, so Her Majesty is stuck with the burden of his entertainment a while longer. Hence this elaborate pageant to get him away from court.’ He waved towards the barge, then glanced around briefly to make sure we were not overheard. ‘I do not blame the French king for refusing his visit, he is a singularly unbearable man. Still, it is quite an achievement – I can think of one or two taverns where I am refused entry, but to be barred from an entire country requires a particular talent for making yourself unwelcome. Which Laski has by the cartload, as you shall see. But you and I shall have a merry time in Oxford none the less – you will amaze the dullards there with your ideas, and I shall look forward to basking in your glory and showing you my old haunts,’ he said, punching me heartily again on the arm. ‘Although, as you know, that is not our whole purpose,’ he added, lowering his voice.

      We stood side by side looking out over the river, busy then with little crafts, wherries and small white-sailed boats criss-crossing the shining water in the spring sun, which illuminated the fronts of the handsome brick and timber buildings along the opposite bank, a glorious panorama with the great spire of St Paul’s church towering over the rooftops far to the north. I thought what a magnificent city London was in our age, and how fortunate I was to be here at all, and in such company. I waited for Sidney to elaborate.

      ‘I have something for you from my future father-in-law, Sir Francis Walsingham,’ he whispered, his eyes still fixed on the river. ‘See what a knighthood gets me, Bruno – a job as your errand boy.’ He drew himself upright and looked about, shielding his eyes with his hand as he peered towards the mooring-place of our craft, before reaching for the oilskin bag he carried and pulling from it a bulging leather purse. ‘Walsingham sent this for you. You may incur certain expenses in the course of your enquiries. Call it an advance against payment.’

      Sir Francis Walsingham. Queen Elizabeth’s Principal Secretary of State, the man behind my unlikely presence on this royal visitation to Oxford; even his name made my spine prickle.

      We walked a little further off from the body of the crowd gathered to marvel as the barge was decked with flowers for our departure. Beside it, a group of musicians had struck up a dance tune and we watched the crowd milling around them.

      ‘But now tell me, Bruno – you have not set your sights upon Oxford merely to debate Copernicus before a host of dull-witted academicians,’ Sidney continued, in a low voice. ‘I knew as soon as I heard you had come to England that you must be on the scent of something important.’

      I glanced quickly around to be sure no one was within earshot.

      ‘I have come to find a book,’ I said. ‘One I have sought for some time, and now I believe it was brought to England.’

      ‘I knew it!’ Sidney grabbed my arm and drew me closer. ‘And what is in this book? Some dark art to unlock the power of the universe? You were dabbling in such things in Padua, as I recall.’

      I could not tell whether he was mocking me still, but I decided to trust to what our friendship had been in Italy.

      ‘What would you say, Philip, if I told you the universe was infinite?’

      He looked doubtful.

      ‘I would say that this goes beyond even the Copernican heresy, and that you should keep your voice down.’

      ‘Well, this is what I believe,’ I said, quietly. ‘Copernicus told only half the truth. Aristotle’s picture of the cosmos, with the fixed stars and the six planets that orbit the earth – this is pure falsehood. Copernicus replaced the Earth with the Sun as the centre of the cosmos, but I go further – I say there are many suns, many centres – as many as there are stars in the sky. The universe is infinite, and if this is so, why should it not be populated with other earths, other worlds, and other beings like ourselves? I have decided it will be my life’s work to prove this.’

      ‘How can it be proved?’

      ‘I will see them,’ I said,