range. Of all evil-doers the American is most to be feared; he uses more ingenuity in the planning of his projects, and will take greater risks in carrying them out than any other malefactor on earth.
From my new station I saw there were two men to deal with. The bidder's face was keen and intellectual; his hands refined, lady-like, clean and white, showing they were long divorced from manual labour, if indeed they had ever done any useful work. Coolness and imperturbability were his beyond a doubt. The companion who sat at his right was of an entirely different stamp. His hands were hairy and sun-tanned; his face bore the stamp of grim determination and unflinching bravery. I knew that these two types usually hunted in couples--the one to scheme, the other to execute, and they always formed a combination dangerous to encounter and difficult to circumvent.
There was a buzz of conversation up and down the hall as these two men talked together in low tones. I knew now that I was face to face with the most hazardous problem of my life.
I whispered to the auctioneer, who bent his head to listen. He knew very well who I was, of course.
'You must not give up the necklace,' I began.
He shrugged his shoulders.
'I am under the orders of the official from the Ministry of the Interior. You must speak to him.'
'I shall not fail to do so,' I replied. 'Nevertheless, do not give up the box too readily.'
'I am helpless,' he protested with another shrug. 'I obey the orders of the Government.'
Seeing it was useless to parley further with the auctioneer, I set my wits to work to meet the new emergency. I felt convinced that the cheque would prove to be genuine, and that the fraud, wherever it lay, might not be disclosed in time to aid the authorities. My duty, therefore, was to make sure we lost sight neither of the buyer nor the thing bought. Of course I could not arrest the purchaser merely on suspicion; besides, it would make the Government the laughing-stock of the world if they sold a case of jewels and immediately placed the buyer in custody when they themselves had handed over his goods to him. Ridicule kills in France. A breath of laughter may blow a Government out of existence in Paris much more effectually than will a whiff of cannon smoke. My duty then was to give the Government full warning, and never lose sight of my man until he was clear of France; then my responsibility ended.
I took aside one of my own men in plain clothes and said to him,--
'You have seen the American who has bought the necklace?'
'Yes, sir.'
'Very well. Go outside quietly, and station yourself there. He is likely to emerge presently with the jewels in his possession. You are not to lose sight of either the man or the casket. I shall follow him and be close behind him as he emerges, and you are to shadow us. If he parts with the case you must be ready at a sign from me to follow either the man or the jewels. Do you understand?' 'Yes, sir,' he answered, and left the room.
It is ever the unforeseen that baffles us; it is easy to be wise after the event. I should have sent two men, and I have often thought since how admirable is the regulation of the Italian Government which sends out its policemen in pairs. Or I should have given my man power to call for help, but even as it was he did only half as well as I had a right to expect of him, and the blunder he committed by a moment's dull-witted hesitation--ah, well! there is no use of scolding. After all the result might have been the same.
Just as my man disappeared between the two folding doors the official from the Ministry of the Interior entered. I intercepted him about half-way on his journey from the door to the auctioneer.
'Possibly the cheque appears to be genuine,' I whispered to him.
'But certainly,' he replied pompously. He was an individual greatly impressed with his own importance; a kind of character with which it is always difficult to deal. Afterwards the Government asserted that this official had warned me, and the utterances of an empty-headed ass dressed in a little brief authority, as the English poet says, were looked upon as the epitome of wisdom.
'I advise you strongly not to hand over the necklace as has been requested,' I went on.
'Why?' he asked.
'Because I am convinced the bidder is a criminal.'
'If you have proof of that, arrest him.'
'I have no proof at the present moment, but I request you to delay the delivery of the goods.'
'That is absurd,' he cried impatiently. 'The

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