'My dear Merevale, my entire form is capable of any crime except the theft of money. A boy might have taken the cups for a joke, or just for the excitement of the thing, meaning to return them in time for the Sports. But the two pounds knocks that on the head. It must have been a professional.'

'I always said that the Pavilion was a very unsafe place in which to keep anything of value,' said Mr Thompson.

'You were profoundly right, Thompson,' replied Perkins. 'You deserve a diploma.'

'This business is rather in your line, Thompson,' said Merevale. 'You must bring your powers to bear on the subject, and scent out the criminal.'

Mr Thompson took a keen pride in his powers of observation. He would frequently observe, like the lamented Sherlock Holmes, the vital necessity of taking notice of trifles. The daily life of a Sixth Form master at a big public school does not afford much scope for the practice of the detective art, but Mr Thompson had once detected a piece of cribbing, when correcting some Latin proses for the master of the Lower Third, solely by the exercise of his powers of observation, and he had never forgotten it. He burned to add another scalp to his collection, and this Pavilion burglary seemed peculiarly suited to his talents. He had given the matter his attention, and, as far as he could see, everything pointed to the fact that skilled hands had been at work.

From eleven until half-past twelve that day, the Sixth were doing an unseen examination under the eye of the Headmaster, and Mr Thompson was consequently off duty. He took advantage of this to stroll down to the Pavilion and make a personal inspection of the first room, from which what were left of the prizes had long been removed to a place of safety.

He was making his way to the place where the ground-man was usually to be found, with a view to obtaining the keys, when he noticed that the door was already open, and on going thither he came upon Biffen, the ground-man, in earnest conversation with a stranger.

'Morning, sir,' said the ground-man. He was on speaking terms with most of the masters and all the boys. Then, to his companion, 'This is Mr Thompson, one of our masters.'

'Morning, sir,' said the latter. 'Weather keeps up. I am Inspector Roberts, Scotland Yard. But I think we're in for rain soon. Yes. 'Fraid so. Been asked to look into this business, Mr Thompson. Queer business.'

'Very. Might I ask—I am very interested in this kind of thing—whether you have arrived at any conclusions yet?'