great deal yet to be cleared up.

"I told Tassoc, next morning, what I had discovered, and through the
whole of every night, for five nights, we kept a close watch 'round the
East Wing; but there was never a sign of anyone prowling about; and all
the time, almost from evening to dawn, that grotesque whistling would
hoon incredibly, far above us in the darkness.

"On the morning after the fifth night, I received a wire from here,
which brought me home by the next boat. I explained to Tassoc that I was
simply bound to come away for a few days; but told him to keep up the
watch 'round the castle. One thing I was very careful to do, and that
was to make him absolutely promise never to go into the Room, between
sunset and sunrise. I made it clear to him that we knew nothing definite
yet, one way or the other; and if the room were what I had first thought
it to be, it might be a lot better for him to die first, than enter it
after dark.

"When I got here, and had finished my business, I thought you chaps would
be interested; and also I wanted to get it all spread out clear in my
mind; so I rung you up. I am going over again to-morrow, and when I get
back, I ought to have something pretty extraordinary to tell you. By the
way, there is a curious thing I forgot to tell you. I tried to get a
phonographic record of the whistling; but it simply produced no
impression on the wax at all. That is one of the things that has made me
feel queer, I can tell you. Another extraordinary thing is that the
microphone will not magnify the sound--will not even transmit it; seems
to take no account of it, and acts as if it were nonexistent. I am
absolutely and utterly stumped, up to the present. I am a wee bit curious
to see whether any of your dear clever heads can make daylight of it. _I_
cannot--not yet."

He rose to his feet.

"Good night, all," he said, and began to usher us out abruptly, but
without offence, into the night.

A fortnight later, he dropped each of us a card, and you can imagine that
I was not late this time. When we arrived, Carnacki took us straight into
dinner, and when we had finished, and all made ourselves comfortable, he
began again, where he had left off:--

"Now just listen quietly; for I have got something pretty queer to tell
you. I got back late at night, and I had to walk up to the castle, as I
had not warned them that I was coming. It was bright moonlight; so that
the walk was rather a pleasure, than oth