"What was on the negative?" I asked, with much curiosity.

"A picture of the fine wire with which they were grappling for the hook
that held the entrance door open. They were doing it from one of the
crevices in the ceiling. They had evidently made no preparations for
lifting the hook. I suppose they never thought that anyone would make
use of it, and so they had to improvise a grapple. The wire was too fine
to be seen by the amount of light we had in the hall; but the flashlight
'picked it out.' Do you see?

"The opening of the inner doors was managed by wires, as you will have
guessed, which they unshipped after use, or else I should soon have found
them, when I made my search.

"I think I have now explained everything. The hound was killed, of
course, by the men direct. You see, they made the place as dark as
possible, first. Of course, if I had managed to take a flashlight just at
that instant, the whole secret of the haunting would have been exposed.
But Fate just ordered it the other way."

"And the tramps?" I asked.

"Oh, you mean the two tramps who were found dead in the Manor," said
Carnacki. "Well, of course it is impossible to be sure, one way or the
other. Perhaps they happened to find out something, and were given a
hypodermic. Or it is just as probable that they had come to the time of
their dying, and just died naturally. It is conceivable that a great many
tramps had slept in the old house, at one time or another."