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 further? That was the thing. There was, 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 brainstorm 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, and, having "capped" Mr. Downing with the air of one who had been caught in the act of doing something particularly shady, requested that he might be allowed to fetch his bicycle from the shed.
"Your bicycle?" snapped Mr. Downing. Much thinking had made him irritable. "What do you want with your bicycle?"
Riglett shuffled, stood first on his left foot, then on his right, blushed, and finally remarked, as if it were not so much a sound reason as a sort of feeble excuse for the low and blackguardly fact that he wanted his bicycle, that he had got leave for tea that afternoon.
Then Mr. Downing remembered. Riglett had an aunt resident about three miles from the school, whom he was accustomed to visit occasionally on Sunday afternoons during the term.
He felt for his bunch of keys, and made his way to the shed, Riglett shambling behind at an interval of two yards.
Mr. Downing unlocked the door, and there on the floor was the Clue!
A clue that even Doctor Watson could not have overlooked.
Mr. Downing saw it, but did not immediately recognize it for what it was. What he saw at first was not a clue, but just a mess. He had a tidy soul and abhorred messes. And this was a particularly messy mess. The greater part of the flooring in the neighborhood of the door was a sea of red paint. The tin from which it had flowed was lying on its side in the middle of the shed. The air was full of the pungent scent.
"Pah!" said Mr. Downing.
Then suddenly, beneath the disguise of the mess, he saw the clue. A footmark! No less. A crimson footmark on the gray concrete!
Riglett, who had been waiting patiently two yards away, now coughed plaintively. The sound recalled Mr. Downing to mundane matters.
"Get your bicycle, Riglett," he said, "and be careful where you tread.
Somebody has upset a pot of paint on the floor."
Riglett, walking delicately through dry places, extracted his bicycle from the rack, and presently departed to gladden the heart of his aunt, leaving Mr. Downing, his brain fizzing with the enthusiasm of the detective, to lock the door and resume his perambulation of the cricket field.
Give Doctor Watson a fair start, and he is a demon at the game. Mr. Downing's brain was now working with a rapidity and clearness which a professional sleuth might have envied.
Paint. Red paint. Obviously the same paint with which Sammy had been decorated. A footmark. Whose footmark? Plainly that of the criminal who had done the deed of decoration.
Yoicks!
There were two things, however, to be considered. Your careful detective must consider everything. In the first place, the paint might have been upset by the groundsman. It was the groundsman's paint. He had been giving a fresh coating to the woodwork in front of the pavilion scoring box at the conclusion of yesterday's match. (A labor of love which was the direct outcome of the enthusiasm for work which Adair had instilled into him.) In that case the footmark might be his.
Note one: Interview the groundsman on this point.
In the second place Adair might have upset the tin and trodden in its contents when he went to get his bicycle in order to fetch the doctor for the suffering MacPhee. This was the more probable of the two contingencies, for it would have been dark in the shed when Adair went into it.
Note two: Interview Adair as to whether he found, on returning to the house, that there was paint on his shoes.
Things were moving.
* * * * *
He resolved to take Adair first. He could get the groundsman's address from him.
Passing by the trees under whose shade Mike and Psmith and Dunster had watched the match on the previous day, he came upon the Head of his house in a deck chair reading a book. A summer Sunday afternoon is the time for reading in deck chairs.
"Oh, Adair," he said. "No, don't get up. I merely wished to ask you if you found any paint on your shoes when you returned to the house last night."
"Paint, sir?" Adair was plainly puzzled. His book had been interesting, and had driven the Sammy incident out of his head.
"I see somebody has spilled some paint on the floor of the bicycle shed.
You did not do that, I suppose, when you went to fetch your bicycle?"
"No, sir."
"It is spilled all over the floor. I wondered whether you had happened to tread in it. But you say you found no paint on your shoes this morning?"
"No, sir, my bicycle is always quite near the door of the shed. I didn't go into the shed at all."
"I see. Quite so. Thank you, Adair. Oh, by the way, Adair, where does
Markby live?"
"I forget the name of his cottage, sir, but I could show you in a second. It's one of those cottages just past the school gates, on the right as you turn out into the road. There are three in a row. His is the first you come to. There's a barn just before you get to them."
"Thank you. I shall be able to find them. I should like to speak to
Markby for a moment on a small matter."
A sharp walk took him to the cottages Adair had mentioned. He rapped at the door of the first, and the groundsman came out in his shirt sleeves, blinking as if he had just waked up, as was indeed the case.
"Oh, Markby!"
"Sir?"
"You remember that you were painting the scoring box in the pavilion last night after the match?"
"Yes, sir. It wanted a lick of paint bad. The young gentlemen will
scramble about and get through the window. Makes it look shabby, sir. So
I thought I'd better give it a coating so as to look shipshape when the