‘To shoot King Humbert,’ I replied.

The man gasped at me in sheer amazement.

‘I am going to put you to a practical test,’ I explained. ‘I am going to try and discharge a blank cartridge at the King. If you can prevent my doing so, I shall hope that his life is safe.’

‘But what do you expect us to do? We cannot arrest you.’

‘No; that is my point. You know that I am going to kill your King, and yet the law does not permit you to interfere till you see me put my finger to the trigger of my revolver.’

‘We can stop you at the frontier.’

‘Try,’ I said drily.

He tried. A week later I was in Rome.

In reality I did not intend to go quite so far as I had threatened. To do so would have been offensive to his Majesty. What I desired was to put the police thoroughly on the alert. I hoped to stimulate them into taking precautions which would be effective against a real assassin.

For I knew better than to think that Menelik’s envoy would go away satisfied with having despatched me on the errand of death. I did not believe the swarthy figure with the formidable white teeth would leave New York till he had received some certain assurance of the success of his murderous plans.