"The thief must have known that the diamonds were in the bedroom, and that a number of people would be present on Sunday night, therefore he chose a time when he would be most likely to escape detection. We believe that a detective has gone down to Toorak to make inquiries, and we have no doubt that the thief will soon be secured, as it would be impossible for such valuable jewels to be disposed of in Melbourne or other colonial cities without arousing suspicion." It was Fenton who insisted upon a detective being employed to investigate the robbery, as, for some extraordinary reason, Kitty seemed unwilling to allow the matter to be inquired into. The detective who accompanied Fenton to Kitty's house was known by the name of Naball, and on the retirement of Kilsip had taken his place. He was only of the age of thirty, but remarkably clever, and had already distinguished himself in several difficult cases. Detective work was a positive mania with him, and he was never so happy as when engaged on a difficult case--it had for him the same fascination as an abstruse mathematical problem would have for an enthusiastic student. To Kilsip belonged the proud honour of having discovered this genius, and it seemed as though the pupil would soon surpass the master in his wonderful instinct for unravelling criminal puzzles. Mr. Naball was an ordinary-looking young man, who always dressed fashionably, and had very little to say for himself, so that few guessed the keen astute brain that was hidden under this somewhat foppish exterior. He listened to everything said to him, and rarely ventured an opinion, but the thieves of Melbourne well knew that when "The Toff," as they called Naball, was on their track, there was very little chance of escape from punishment. On this day when they were on their way to Toorak, Fenton was excited over the matter, and ventured all kinds of theories on the subject, while Mr. Naball smoked a cigarette, and admired the fit of his gloves. "Do you think the thief will try and dispose of them in Melbourne?" he asked. "Possibly," returned Naball, "if he's a born fool." "I'm certain I know the thief," said Fenton quietly. "I told you that the man Villiers was seen about the place on the night of the robbery." "By whom?" "Myself and Caprice." "Who saw him last?" "Caprice." "Oh," said Naball imperturbably, "then she's the best person to see on the subject." "He's a bad lot," said Fenton; "he was mixed up in that poisoning case eight years ago." "The Midas case?" "Yes. Caprice, or rather Kitty Marchurst, was concerned in it also." "So I believe," replied Naball; "every one was innocent except Jarper and Vandeloup--one was hanged, the other committed suicide. I don't see what it has to do with the present case." "Simply this," said Fenton sharply, annoyed at the other's tone, "Villiers is a scoundrel, and wouldn't stop at robbery if he could make some money over it." "He knew Caprice had diamonds worth five thousand?"