"Well, you're all in it in a kind of way. And if something unaccountable happens to one of you a day or two before something unaccountable happens to the whole house, one is well, interested." It was a good enough reason, but it wasn't the reason he had been on the point of giving.

"I see. Well?"

Antony knocked out his pipe and got up slowly.

"Well then, let's find the way from the house by which Miss Norris came."

Bill jumped up eagerly.

"By Jove! Do you mean there's a secret pa.s.sage?"

"A secluded pa.s.sage, anyway. There must be."

"I say, what fun! I love secret pa.s.sages. Good Lord, and this afternoon I was playing golf just like an ordinary merchant! What a life! Secret pa.s.sages!"

They made their way down into the ditch. If an opening was to be found which led to the house, it would probably be on the house side of the green, and on the outside of the ditch. The most obvious place at which to begin the search was the shed where the bowls were kept. It was a tidy place as anything in Mark's establishment would be. There were two boxes of croquet things, one of them with the lid open, as if the b.a.l.l.s and mallets and, hoops (neatly enough put away, though) had been recently used; a box of bowls, a small lawn-mower, a roller and so forth. A seat ran along the back of it, whereon the bowls-players could sit when it rained.

Antony tapped the wall at the back.

"This is where the pa.s.sage ought to begin. It doesn't sound very hollow, does it?"

"It needn't begin here at all, need it?" said Bill, walking round with bent head, and tapping the other walls. He was just too tall to stand upright in the shed.

"There's only one reason why it should, and that is that it would save us the trouble of looking anywhere else for it. Surely Mark didn't let you play croquet on his bowling-green?" He pointed to the croquet things.

"He didn't encourage it at one time, but this year he got rather keen about it. There's really nowhere else to play. Personally I hate the game. He wasn't very keen on bowls, you know, but he liked calling it the bowling-green, and surprising his visitors with it."

Antony laughed.

"I love you on Mark," he said. "You're priceless."

He began to feel in his pockets for his pipe and tobacco, and then suddenly stopped and stiffened to attention. For a moment he stood listening, with his head on one side, holding up a finger to bid Bill listen too.

"What is it?" whispered Bill.

Antony waved him to silence, and remained listening. Very quietly he went down on his knees, and listened again. Then he put his ear to the floor. He got up and dusted himself quickly, walked across to Bill and whispered in his ear:

"Footsteps. Somebody coming. When I begin to talk, back me up."

Bill nodded. Antony gave him an encouraging pat on the back, and stepped firmly across to the box of bowls, whistling loudly to himself. He took the bowls out, dropped one with a loud bang on the floor, said, "Oh, Lord!" and went on:

"I say, Bill, I don't think I want to play bowls, after all."

"Well, why did you say you did?" grumbled Bill.

Antony flashed a smile of appreciation at him.

"Well, I wanted to when I said I did, and now I don't want to."

"Then what do you want to do?"

"Talk."

"Oh, right-o!" said Bill eagerly.

"There's a seat on the lawn--I saw it. Let's bring these things along in case we want to play, after all."

"Right-o!" said Bill again. He felt safe with that, not wishing to commit himself until he knew what he was wanted to say.

As they went across the lawn, Antony dropped the bowls and took out his pipe.

"Got a match?" he said loudly.

As he bent his head over the match, he whispered, "There'll be somebody listening to us. You take the Cayley view," and then went on in his ordinary voice, "I don't think much of your matches, Bill," and struck another. They walked over to the seat and sat down.

"What a heavenly night!" said Antony.

"Ripping."

"I wonder where that poor devil Mark is now."

"It's a rum business."

"You agree with Cayley that it was an accident?"

"Yes. You see, I know Mark."

"H'm." Antony produced a pencil and a piece of paper and began to write on his knee, but while he wrote, he talked. He said that he thought Mark had shot his brother in a fit of anger, and that Cayley knew, or anyhow guessed, this and had tried to give his cousin a chance of getting away.

"Mind you, I think he's right. I think it's what any of us would do. I shan't give it away, of course, but somehow there are one or two little things which make me think that Mark really did shoot his brother I mean other than accidentally."

"Murdered him?"

"Well, manslaughtered him, anyway. I may be wrong. Anyway, it's not my business."

"But why do you think so? Because of the keys?"

"Oh, the keys are a wash-out. Still, it was a brilliant idea of mine, Wasn't it? And it would have been rather a score for me if they had all been outside."

He had finished his writing, and now pa.s.sed the paper over to Bill. In the clear moonlight the carefully printed letters could easily be read:

"GO ON TALKING AS IF I WERE HERE. AFTER A MINUTE OR TWO, TURN ROUND AS IF I WERE SITTING ON THE GRa.s.s BEHIND YOU, BUT GO ON TALKING."

"I know you don't agree with me," Antony went on as Bill read, "but you'll see that I'm right."

Bill looked up and nodded eagerly. He had forgotten golf and Betty and all the other things which had made up his world lately. This was the real thing. This was life. "Well," he began deliberately, "the whole point is that I know Mark. Now, Mark-"

But Antony was off the seat and letting himself gently down into the ditch. His intention was to crawl round it until the shed came in sight. The footsteps which he had heard seemed to be underneath the shed; probably there was a trap-door of some kind in the floor. Whoever it was would have heard their voices, and would probably think it worth while to listen to what they were saying. He might do this merely by opening the door a little without showing himself, in which case Antony would have found the entrance to the pa.s.sage without any trouble to himself. But when Bill turned his head and talked over the back of the seat, it was probable that the listener would find it necessary to put his head outside in order to hear, and then Antony would be able to discover who it was. Moreover, if he should venture out of his hiding-place altogether and peep at them over the top of the bank, the fact that Bill was talking over the back of the seat would mislead the watcher into thinking that Antony was still there, sitting on the gra.s.s, no doubt, behind the seat, swinging his legs over the side of the ditch.