Bill again.

"You will see what, Bill," said Antony; "because we shall be there."

"Are we going to watch him?"

"Yes, if the Inspector finds nothing."

"That's good," said Bill.

If it were a question of Cayley or the Law, he was quite decided as to
which side he was taking. Previous to the tragedy of yesterday he had
got on well enough with both of the cousins, without being in the least
intimate with either. Indeed, of the two he preferred, perhaps, the
silent, solid Cayley to the more volatile Mark. Cayley's qualities, as
they appeared to Bill, may have been chiefly negative; but even if this
merit lay in the fact that he never exposed whatever weaknesses he may
have had, this is an excellent quality in a fellow-guest (or, if you
like, fellow-host) in a house where one is continually visiting. Mark's
weaknesses, on the other hand, were very plain to the eye, and Bill had
seen a good deal of them.

Yet, though he had hesitated to define his position that morning in
regard to Mark, he did not hesitate to place himself on the side of the
Law against Cayley. Mark, after all, had done him no harm, but Cayley
had committed an unforgivable offence. Cayley had listened secretly to
a private conversation between himself and Tony. Let Cayley hang, if the
Law demanded it.

Antony looked at his watch and stood up.

"Come along," he said. "It's time for that job I spoke about."

"The passage?" said Bill eagerly.

"No; the thing which I said that I had to do this afternoon."

"Oh, of course. What is it?"

Without saying anything, Antony led the way indoors to the office.

It was three o'clock, and at three o'clock yesterday Antony and Cayley
had found the body. At a few minutes after three, he had been looking
out of the window of the adjoining room, and had been surprised suddenly
to find the door open and Cayley behind him. He had vaguely wondered at
the time why he had expected the door to be shut, but he had had no time
then to worry the thing out, and he had promised himself to look into
it at his leisure afterwards. Possibly it meant nothing; possibly, if
it meant anything, he could have found out its meaning by a visit to
the office that morning. But he had felt that he would be more likely
to recapture the impressions of yesterday if he chose as far as possible
the same conditions for his experiment. So he had decided that three
o'clock that afternoon should find him once more in the office.

As he went i