"'Something seemed to be telling me to get out, quick,' I said. 'Sounds a
bit silly, superstitious, I know; but when you are meddling with this
sort of thing, you've got to take notice of queer fancies, and risk being
laughed at.'

"I told him then about the 'Grey Dog' business, and he nodded a lot to
that. 'Of course,' I said, 'this may be nothing more than those would-be
rivals of yours playing some funny game; but, personally, though I'm
going to keep an open mind, I feel that there is something beastly and
dangerous about this thing.'

"We talked for a while longer, and then Tassoc suggested billiards, which
we played in a pretty half-hearted fashion, and all the time cocking an
ear to the door, as you might say, for sounds; but none came, and later,
after coffee, he suggested early bed, and a thorough overhaul of the room
on the morrow.

"My bedroom was in the newer part of the castle, and the door opened into
the picture gallery. At the East end of the gallery was the entrance to
the corridor of the East Wing; this was shut off from the gallery by two
old and heavy oak doors, which looked rather odd and quaint beside the
more modern doors of the various rooms.

"When I reached my room, I did not go to bed; but began to unpack my
instrument trunk, of which I had retained the key. I intended to take one
or two preliminary steps at once, in my investigation of the
extraordinary whistling.

"Presently, when the castle had settled into quietness, I slipped out of
my room, and across to the entrance of the great corridor. I opened one