He was one of the happiest men in all the world.

Not until dinner did he again meet Mrs Jesup and her daughter. After describing what an excellent run they had had, the millionaire’s wife said:

“Oh, Mary has been telling me something about a mysterious fair-haired man whom you say has been watching her.”

“Yes,” replied his Highness. “He’s been hanging about for some days. I fancy he’s no good—one of those fellows who live in hotels on the look-out for pigeons.”

“What we call in America a crook—eh?”

“Exactly. At least that’s my opinion,” he declared in confidence.

Mrs Jesup and her daughter appeared both very uneasy, a circumstance which the Prince did not fail to notice. They went up to his salon where they had coffee, and then retired early.

Half an hour later, while his Highness was lazily enjoying one of his brown “Petroffs,” the millionaire’s wife, with blanched face, burst into the room crying:

“Prince! Oh, Prince! The whole of my jewels and Mary’s have been stolen! Both cases have been broken open and the contents gone! My pearls too! What shall we do?” His Highness started to his feet astounded. “Do? Why find that fair-haired man!” he replied. “I’ll go at once to the manager.” He sped downstairs, and all was quickly in confusion. The manager recollected the man, who had given the name of Mason, and who had left suddenly on the previous morning. The police were telephoned for, and over the wires to London news of the great jewel robbery was flashed to New Scotland Yard.

There was little sleep for either of the trio that night. Examination showed that whoever the thief was, he had either been in possession of the keys of the ladies’ trunks, wherein were the jewel-cases, or had obtained impressions of them, for after the jewels had been abstracted the trunks had been relocked.