"Dio sia con te," Paolo whispered, as I pulled myself through the small window and twisted my body around so that I was hanging by my fingertips, tearing my habit as I did so. Then, trusting to God and chance, I let go. As I landed clumsily on the roof below, I heard the sound of the little casement closing and hoped Paolo had been in time.

The moonlight was a blessing and a curse; I kept close to the shadows of the wall as I crossed the garden behind the monks' quarters and, with the help of wild vines, I managed to pull myself over the far wall, the boundary of the monastery, where I dropped to the ground and rolled down a short slope to the road. Immediately I had to throw myself into the shadow of a doorway, trusting to the darkness to cover me, because a rider on a black horse was galloping urgently up the narrow street in the direction of the monastery, his cloak undulating behind him. It was only when I lifted my head, feeling the blood pounding in my throat, and recognised the round brim of his hat as he disappeared up the hill toward the main gate, that I knew the figure who had passed was the local Father Inquisitor, summoned in my honour.

That night I slept in a ditch on the outskirts of Naples when I could walk no farther, Paolo's cloak a poor defence against the frosty night. On the second day, I earned a bed for the night and half a loaf of bread by working in the stables of a roadside inn; that night, a man attacked me while I slept and I woke with cracked ribs, a bloody nose, and no bread, but at least he had used his fists and not a knife, as I soon learned was common among the vagrants and travellers who frequented the inns and taverns on the road to Rome. By the third day, I was learning to be vigilant, and I was more than halfway to Rome. Already I missed the familiar routines of monastic life that had governed my days for so long, and already I was thrilled by the notion of freedom. I no longer had any master except my own imagination. In Rome I would be walking into the lion's maw, but I liked the boldness of the wager with Providence; either my life would begin again as a free man, or the Inquisition would track me down and feed me to the flames. But I would do everything in my power to ensure it was not the latter-I was not afraid to die for my beliefs, but not until I had determined which beliefs were worth dying for.

On a horse borrowed from the French ambassador to the court of Queen Elizabeth of England, I rode across London Bridge on the morning of May 20, 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 toward 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 toward 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 never tired of reminding me-but in Padua we had immediately discovered the gift of making each other 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; straightaway 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 toward 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 refuses to allow him into the country, so Her Majesty is stuck with the burden of his entertainment awhile longer. Hence this elaborate pageant to get him away from court." He waved toward 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 nonetheless-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 on the arm again. "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, which was busy with little crafts, wherries, and small white-sailed boats crisscrossing the shining water in the spring sun that 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 toward 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."