The young man licked his lips.

'Yes,' he muttered.

'And if you do not satisfy my curiosity,' Cranston continued, 'I am going to knock on the door, leave, and tomorrow you will hang. So, if I want to buy a poison in London, where would I go?'

'Nightshade House.'

'Where's that?'

'It's owned by Simon Foreman. It's in an alleyway.' The young man screwed up his eyes, concentrating on getting the facts right. 'That's right, a street called Piper Street, Nightshade House in Piper Street. Simon Foreman would sell anything for a great price and not ask any questions. It is probable the poison in that phial came from him. He could tell you.'

'One further question. Sir Thomas Springall – you knew of him?*

The young man nodded his head towards the door.

'Like Fitzosbert, he liked young boys, the softer and more pliant the better, or so the whisper says. He went to houses where such people meet. Springall was also a moneylender, a usurer. He had few friends and many enemies. There was gossip about him.' The young man drained his cup and sat cradling it, eyes fixed on the wine remaining in the jug. 'It was only a matter of time before someone used that information.' He shrugged. 'But Springall had powerful friends at court and in the church. No bailiff or constable would touch him. He and all his kind meet in a tavern outside the city on the Mile End Road – it's called the Gaveston. You can buy what you want there, as long as you pay in good gold. That's all I know.'

Fitzosbert banged on the door.

'Sir John, are you finished?'

'Yes,' Cranston called. 'Listen!' he said to Solper. 'You are sure you know nothing else?'

The young fellow shook his head.

'I have told you all I know. The pardon, you will keep your word?'

'Of course. God keep you, Solper,' he muttered and went towards the door just as Fitzosbert threw it open. The coroner gently pushed the keeper out before him, took out his purse and clinked a few coins into his hand.

'I thank you again for your hospitality, Fitzosbert,' he said. 'Look after our friend here. Some more wine, a better cell. Letters will come down from the Guildhall tomorrow. You will act accordingly. You understand?'

Fitzosbert smiled and winked. 'Of course, Sir John. No problem. I will carry out any order given to me by such an illustrious coroner of the city.'

Cranston pulled a face and he and the friar walked as fast as dignity would allow from that loathsome place. When the great gate of Newgate slammed behind them, Cranston leaned against it, gasping for clean air, his great body quivering like a beached whale's.

'Thank God!' he spluttered. 'Thank God to be out of there! Pray to your God and anyone else you know that you never land up in the power of Fitzosbert, in one of those Godforsaken cells!'

He looked up at the great tower soaring above him.

'If I had my way, I would burn the entire place to the ground and hang Fitzosbert on a scaffold as high as the sky. But, come, Whitefriars and the Springall mansion await.'

They collected their horses and made their way down Fleet Street towards the high white chalk store building of White- friars. As the press of people was so great, they walked their horses.

'Do you think Solper was right about Springall?' asked Athelstan.

Sir John nodded. 'I suspected as much. Many men have such inclinations. Yet, you know the sentence for such crimes: boiled alive in a great vat over a roaring fire at Southwark. Not the usual end for a powerful London merchant! Hence the secrecy, and hence perhaps the vicious quarrel with Brampton, the rather effete manners of Master Buckingham, as well as the fact that Sir Thomas did not sleep with his wife.' He looked slyly at the friar. 'Such a woman, such a body! It fair makes your mouth water. Why should a real man lock himself away from such pleasures, eh?' He stopped momentarily to watch a juggler. 'Springall, like many a man,' he said, pushing forward again, 'had his public life and his private one. I suspect if the drapes were really pulled aside, we would find a stinking mess.' He lifted his hand and gestured to the great houses on either side, soaring four storeys above them, blocking out the hot afternoon sun. 'In any of these buildings scandal, sin, failings and weaknesses are to be found. They even say,' he nudged Athelstan playfully, that vices similar to SpringalPs are found in monasteries and among friars. What do you think of that, Brother, eh?'

'I would say that priests are like any other men, be they lawyer or coroner, Sir John, they have their weaknesses. And, but for the grace of God…' Athelstan let his voice trail away. 'But why are we here?' he asked angrily, realising they were entering the area around the great Carmelite monastery.

Cranston touched him on the arm and pointed to the far corner, just past the huge gateway. An emaciated fellow with jet black hair, thin lips and large brooding eyes caught the friar's eye. The man was dressed completely in black, his dark cloak covered with the most fantastic symbols: pentangles, stars, moons, suns, and on his head a pointed hat. He had laid out a great canvas sheet before him, bearing different phials and small bowls. Now he stood still, his very appearance drawing the people around him.

'Watch this!' Cranston whispered. 'The fellow's our guide.'

The man took out two small whistles and, pushing one into each corner of his mouth, began to play a strange, rhythmic, haunting tune. He then put down the instruments and held up powerful hands.

'Ladies and gentlemen, knights, courtiers, members of the Guild!' He caught Athelstan's eye. 'Friars, priests, citizens of London! I am Doctor Mirablis. I have studied in Byzantium and Trezibond, and travelled across the land to the great Cham of Tartary. I have seen battle fleets in the Black Sea and the great war galleons of the Caspian. I have supped with the Golden Horde of Genghis Khan. I have crossed deserts, visited fabulous cities, and in my journeys I have amassed many secrets and mysteries!'

His claims were greeted with roars of laughter. Cranston and Athelstan drew closer. An apprentice from a nearby stall took out a bullock horn, scooped some dirty water from a rain barrel and began to sprinkle the magician with it. Dr Mirabilis just ignored him and held up his hands, calming the clamour and good natured cat-calls.

'I will show you I have power over matter. Over the very birds in the air.' He turned, pointing up to the top of the monastery wall. 'See that pigeon there!' Everyone's eyes followed the direction of his finger. 'Now, look,' the fellow continued, and taking a piece of black charcoal, painted a rough picture of the bird on the monastery wall. He then began to stab the drawing, uttering magical incantations. The clamour grew around him, Cranston and Athelstan moved closer, their hands on their wallets as the crowd was infested with naps, foists and pickpockets as a rick of hay with mice and rats. Mirabilis continued to stab the picture, muttering low-voiced curses, looking up at the walls where the pigeon was still standing. Suddenly the bird, as if influenced by the magical incantations against the picture below, twitched and dropped down dead. The 'oohs' and 'ahs' of reverence which greeted this would have been the envy of any priest or preacher. Cranston grinned and gripped Athelstan by the wrist.

'Wait awhile,' he said.

Doctor Mirabilis's reputation now enhanced by this miracle, he began to sell his jars and philtres of crushed diamond, skin of newt collected at midnight, batwing, marjoram, fennel and hyssop.

'Certain cures,' he said, 'for any agues, aches and rheums you suffer from.'

For a while business was brisk, then the crowd drifted away to watch an old man further down the lane who cavorted and danced in the most fantastical way. Cranston handed the reins of his horse to Athelstan and went over to the 'doctor.'