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270 to detect anybody, unless you knew who had really done the crime. As he brooded over the case in hand, his sympathy for Dr. Watson increased with every minute, and he began to feel a certain resentment against Sir Arthur Conan Doyle. It was all very well for Sir Arthur to be so shrewd and infallible about tracing a mystery to its source, but he knew perfectly well who had done the thing before he started!

Now that he began really to look into this matter of the alarm bell and the painting of Sammy, the conviction was creeping over him that the problem was more difficult than a casual observer might imagine. He had got as far as finding that his quarry of the previous night was a boy in Mr. Outwood's house, but how was he to get any farther? That was the thing. There were, of course, only a limited number of boys in Mr. Outwood's house as tall as the one he had pursued; but even if there had been only one other, it would have complicated matters. If you go to a boy and say, "Either you or Jones were out of your house last night at twelve o'clock," the boy does not reply, "Sir, I cannot tell a lie—I was out of my house last night at twelve o'clock." He simply assumes the animated expression of a stuffed fish, and leaves the next move to you. It is practically Stalemate.

All these things passed through Mr. Downing's mind as he walked up and down the cricket field that afternoon.

What he wanted was a clue. But it is so hard for the novice to tell what is a clue and what isn't. Probably, if he only knew, there were clues lying all over the place, shouting to him to pick them up.

What with the oppressive heat of the day and the fatigue of hard thinking, Mr. Downing was working up for a brain-storm, when Fate once more intervened, this time in the shape of Riglett, a junior member of his house.

Riglett slunk up in the shamefaced way peculiar to some boys, even when they have done nothing wrong,