Arthur puffed out his cheeks. ‘Now then, we must think on the implications of this afternoon’s attempt on my life. Pass the word to our agents, that they are to keep their eyes and ears open for any hint of another plot. I want to know everything. Also, the embassy’s officials will need to be aware of the threat. They will need to be diligent about their safety whenever they leave the embassy. I will take an escort with me from now on. Pick four good men. They are to ride behind my carriage when I go out. They are to dress plainly and keep their weapons out of sight. Is that clear?’

‘Yes, your grace. And what of your wife’s excursions?’

‘My wife?’ Arthur stroked his chin. ‘I’ll speak to her first. At dinner.’

‘I don’t understand, my dear.’ Kitty shook her head. ‘If there is nothing to fear, then why should I curtail my social rounds?’

‘It is just a precaution,’ Arthur replied gently. ‘You’ve seen how it is in the streets. The Bonapartists are more open about their grievances than ever. Now is not a particularly good time to be English in Paris. But it will pass. The new regime will not tolerate them for much longer.’

Kitty cheerfully sawed into another piece of beef as she replied, ‘My dear Arthur, I have not seen anything to discomfort me when I am abroad. But if it is your wish that I exercise caution, then I will.’

‘Thank you, Kitty.’

She popped her fork lightly into her mouth and chewed the meat before she spoke again. ‘And what of the children? Are they to join us at Christmas, as we planned?’

Arthur had already considered this, and nodded. ‘Let them come. I am sure there is no danger. Besides, if they did not come our French hosts might be offended.’

‘Oh?’

‘Kitty, we must show them that we are not fearful. We must continue as normal.’

‘You said there was no danger.’

‘Nor is there. No real danger.’

Kitty paused and narrowed her eyes as she stared across the table at her husband.‘You are not telling me the whole truth, are you? What has happened, Arthur?’

‘Nothing that need concern you, my dear,’ he replied, with what he hoped was a comforting smile. ‘Perhaps I am being over-cautious.’

‘And perhaps you are endangering our sons.’

Arthur stared at her for a moment. ‘I would never do that. Believe me. They will be safe enough in Paris, I give you my word.’

‘Safe enough?’

‘By God, Kitty, I tell you they will be safe!’ Arthur snapped. ‘Arthur and Charles will join us here. It is decided.’

Kitty lowered her knife and fork and sat back in her chair, her expression nervous. ‘There is no need to raise your voice, my dear. I bend to your will in all things. You know that, and I know that you think less of me for it. I am not such a fool as you sometimes think.’

‘Kitty, I never—’

‘Hush. I know you would never say it to my face. But I ask you, what kind of father places his children in a position of lesser safety for the sake of his country’s reputation?’

Arthur stared at her in silence for a moment before he responded flatly, ‘We do what we must for our country. All of us. It is as simple as that. It is the duty that comes with our rank, even for the youngest of us.’

Arthur and Charles arrived late in December, escorted by a maidservant and three footmen, one of whom turned out to be a government agent carrying a despatch for Arthur. After greeting his children he withdrew to his office to break open the seal and read the contents. Lord Liverpool had given much thought to the deteriorating situation in Paris and was anxious that Arthur be preserved from the dangers of assassins since his country may have need of his services as a general once again. Therefore Castlereagh was to be recalled from Vienna and Arthur would represent Britain’s interests in his place. Somerset would remain in Paris to run the embassy and Arthur was advised that Kitty and the children should also remain, to reassure King Louis that Arthur intended to return to Paris once the Congress had concluded its business.

Although the diplomatic situation was still grave there was some good news. A peace had been agreed between Britain and the United States. That, Arthur was reassured, would mean that the government’s attention could focus on Europe. It would also mean that more soldiers would be available for deployment in the army under Arthur’s command in the Netherlands.

Christmas passed peacefully and Arthur and Kitty did their best to entertain the two boys by showing them the sights of the French capital. Even as he tried his best to play the role of a dutiful father, Arthur’s mind was distracted by the burdens of wider affairs. He had urged the French King to order Talleyrand to co-operate with Castlereagh in Vienna, and early in the new year a secret treaty was signed, binding Britain, France and Austria in a pact against the other two powers if war broke out.

Arthur left Paris in the last week of January, travelling by carriage to Vienna where he arrived on the evening of 3 February. Despite the late hour he sought out Castlereagh at the fine mansion that had been allotted to the English representatives at the Congress. Castlereagh looked grey and exhausted when Arthur was shown into his study by a servant. The other man rose, smiled wearily and came across the room to take Arthur’s hand.

‘Good to see you again, Arthur. How was the journey?’

‘Long and wet.’

‘Loquacious as ever,’ Castlereagh chuckled. ‘Still, reticence will serve you well here in Vienna. Despite civilised appearances - there seems to be a ball, banquet or ballet happening almost every hour of the day - the place is a nest of vipers.’

‘So I gathered from your letters.’

‘Talleyrand and Metternich are the most devious scoundrels I have ever encountered, forever doing the rounds of private salons and offices proposing secret deals and selling confidences. Why, they have turned such practices into a virtual industry. I suppose I should be grateful at least that they happen to be “our” scoundrels. At least for the present.’

‘I take it that you have had to offer them disbursements to support our position?’ Arthur asked as he sat down. Castlereagh resumed his seat and nodded.

‘I probably did not need to have offered such inducements, but the situation is such that I was not prepared to take the risk. Now that we have the treaty signed and sealed, I hope that you will not have to pay them another penny.’ Castlereagh smiled faintly. ‘I know you have a pronounced distaste for bribes and back room chicanery.’

‘That is right,’ Arthur replied firmly. ‘I believe that men of honour can achieve more lasting good through being patient and observant than through politicking.’

‘Then you will be something of an oddity at the Congress.’ Castlereagh paused and looked at Arthur shrewdly. ‘Though I dare say such an approach might win much favour after the deviousness of recent months. Besides, your reputation goes before you. The Tsar considers you to be the greatest hero of the age, to the chagrin of his own generals, of course.’

‘Tsar Alexander is inclined to be generous in his praise,’ Arthur recalled from his meetings with the Tsar in London the previous summer.

‘Don’t be fooled, Arthur. Alexander is as absolute a ruler as Bonaparte ever was, and just as keen to expand his domains. He has managed to dupe the King of Prussia into supporting his claims and paid him off with the promise of a few sops from Poland as well as a free hand as far as the other German states are concerned. If that is permitted then there can be no question of a just equilibrium in Europe, and war will be inevitable. That is what you must prevent at any cost.’ Castlereagh paused briefly. ‘At least with the treaty, you will have a stick to beat them with if Alexander and Frederick William continue to push for more advantages in the final settlement.’