‘Where he was killed. I believe he was murdered.’

Arno didn’t look surprised. He nodded. ‘I feared as much.’

‘Why did you think that?’

‘I received an email message from him. He told me he needed very urgently to talk to me, that he had made a discovery, and that there was danger.’

‘When was this?’

‘The night he died, I believe. I was very sorry to hear of his death.’ Arno shook his head sadly.

‘What kind of danger did he say he was in?’ Ben asked.

‘He did not say. The message seemed to have been written in a hurry.’

Ben glanced at the computer on the old man’s desk. ‘Do you still have that email?’

‘I deleted it immediately after reading it.’

‘You realize that information would have been very important at the inquest into the cause of Oliver’s death?’

‘Yes,’ Arno said softly.

‘But you decided to keep it to yourself that the circumstances might have been suspicious-that it might not have been an accident?’ Ben felt his face flush. Beside him, Leigh was staring at her hands on her lap, and he worried that he was pushing the old man too hard.

Arno sighed heavily and ran his fingers through his thin white hair. ‘I am not proud of what I did. I had my suspicions but no proof. There was a witness to the accident. Who would have believed a crazy old Italian with the reputation of a crank, a conspiracy theorist?’ He paused. ‘And I was afraid.’

‘Afraid of what?’ Leigh asked.

‘That I was also in danger,’ Arno replied. ‘Soon afterwards, intruders came in the night.’

‘Came here?’

‘Yes. I was in the hospital. My blood-it is not healthy. When I returned home, I found that the house had been ransacked. They were searching for something.’

‘What were they searching for?’ Ben asked.

‘For the letter, I believe.’

‘Did they steal it?’

‘No,’ Arno replied. ‘After your brother sent me the message, I put the letter somewhere very secret. Somewhere nobody could ever find it.’

‘May we know where it is?’ Ben asked.

Arno smiled. ‘It is safe,’ he said softly. ‘It has gone home.’

Ben wondered what he meant by that.

Arno went on. ‘But for a long time I myself did not feel safe,’ he said. ‘I felt I was being watched. It went on for months.’

‘I think the letter had something to do with Oliver’s death,’ Leigh said.

The professor looked grim. ‘You may be right.’

‘Can you explain?’

Arno hesitated as he gathered his thoughts. ‘I think I had better start at the beginning. As you know, the subject of your brother’s book was one that I have been studying for many years.’

‘Mozart’s death,’ Leigh said.

‘Not just Mozart’s death, but the events that led up to it, surrounded it and may have caused it…I believe did cause it. For this, we have to go back to the eighteenth century…’

‘With respect, Professor,’ Ben said. ‘We didn’t come here for a history lesson about someone who died over two hundred years ago. We want to know what happened to Oliver.’

‘If you hear me out,’ Arno replied, ‘I think what I tell you may help you understand.’

‘Oliver told me he was doing a lot of research into Mozart and the Freemasons,’ Leigh said.

Arno nodded. ‘It is no secret that Mozart was a Freemason himself. He joined his Lodge in 1784 and remained a Mason until his death seven years later, during which time it is said he rose to the level of Third Degree, Master Mason. Mozart was so dedicated to Freemasonry he even persuaded his father Leopold to join them. He supplied music for Masonic events, and had many friends who were Initiates.’

Ben shifted impatiently in his seat. ‘I don’t understand why this is so important.’

Leigh laid a hand on his arm. ‘Go on, Professor.’

‘Today we think of Freemasonry as something of a joke, or at best a social club like the Rotarians,’ Arno said. ‘But in eighteenth-century Europe it was an extremely important cultural and political force. In 1780s Austria, Freemasonry was a meeting point for the intellectual elite, an important centre for ideas of peace, freedom, and equality. The Masonic Lodges of Vienna comprised many of the most influential names of the time. Many aristocrats, senior politicians and diplomats, high-ranking military officers, bankers and merchants. There were also many intellectuals among them, writers, artists, musicians.’

‘I didn’t know they were so powerful,’ Leigh said.

Arno nodded. ‘They were, but their power was also their undoing. Other forces, even more powerful, were watching with a close eye. In fact, much of our modern knowledge of the Viennese Masons at this time comes from the intelligence material gathered by the Austrian secret police. Freemasonry was officially condemned in the Austrian Empire on the orders of the Pope, and only allowed to exist because of the tolerance of the Emperor, Josef II. But in 1785 Josef’s sympathy grew thin, and he decided that the Masons had become too powerful and influential. He ordered a drastic reduction of the Viennese Lodges, and demanded that the secret police provide him with lists of active Masons. These lists were kept in the files of the court archives.’

‘Why the sudden sea-change?’ Leigh asked.

‘You have to understand the climate of the times,’ Arno explained patiently. ‘Mozart lived in a turbulent age, a revolutionary age. The Americans had only recently overthrown their colonialist British rulers and established a new free nation. Revolution was in the air. By 1789, just two years before Mozart’s death, France stood on the verge of terrible bloodshed.’

‘And the Masons were involved?’

‘Masonry was increasingly associated with the growing revolutionary, anti-royalist current,’ said Arno. ‘With its ideals of liberty, equality and fraternity, it offered a perfect metaphor for the dawning of a new age of free ideas. As the French Revolution gathered steam, some of the revolutionary “clubs”, such as Robespierre’s Jacobins, based their structures on the Masonic Lodges, as well as importing Masonic symbolism into their political ideology. In America, when George Washington laid the foundation stone of the Capitol in Washington he wore with pride the Masonic apron that had been made for him by Adrienne, the wife of the French soldier-revolutionary La Fayette. Thomas Jefferson was another Freemason who drew heavily on those ideals of liberty and equality when he drafted the Declaration of Independence. It was a hugely powerful force with the potential to influence political change across the world.’

‘And so, naturally, it had to be stopped,’ Ben said.

‘Without question,’ replied Arno with a bitter smile. ‘By the late 1780s there were growing concerns in Mozart’s Austria that the Masons were going to plunge the country into the same revolutionary, pro-republic spirit as France and America. It was a dangerous time. Many aristocrats who had initially sympathized with Freemasonry’s ideals began to worry. Then, as the revolutionary mobs tore through France and the aristocracy went to the guillotine, the Austrian clampdown on Freemasonry began in earnest. By 1791 Masonry in Austria was virtually wiped out. It was a period of severe crisis for Mozart and his Lodge brothers.’ He paused. A new Emperor had taken over, Leopold II. The Masons could not tell what his attitude would be to them, but they were not optimistic. Then Mozart and his close colleague, the theatrical producer and fellow Mason Emanuel Schikaneder, had an idea.’

‘What idea?’ Ben asked.

‘They thought that if they could rescue the public image of the Masons, they might help to save the Craft from universal condemnation,’ said Arno. ‘What they did would nowadays be called a huge publicity stunt. They conceived of a grand opera that would reach out to an audience of unprecedented scale. A spectacle that everyone would love, written in popular style. A people’s opera preaching Masonic ideals of the education of men to a higher morality through wisdom, love and goodness, heralding the transition to a new social order. Full of mystical symbols glorifying the Freemasons and their philosophy.’