wife's jewelry. She had died some twelve years back, and the young man
told me that his father had never seemed quite himself since.

"I mentioned to young Jarnock how puzzled I was that the trap had been
set _before_ the service, on the night that the butler was struck; for,
if I understood him aright, his father had been in the habit of setting
the trap late every night and unsetting it each morning before anyone
entered the Chapel. He replied that his father, in a fit of temporary
forgetfulness (natural enough in his neurotic condition), must have set
it too early and hence what had so nearly proved a tragedy.

"That is about all there is to tell. The old man is not (so far as I
could learn), really insane in the popularly accepted sense of the word.
He is extremely neurotic and has developed into a hypochondriac, the
whole condition probably brought about by the shock and sorrow resultant
on the death of his wife, leading to years of sad broodings and to
overmuch of his own company and thoughts. Indeed, young Jarnock told me
that his father would sometimes pray for hours together, alone in the
Chapel." Carnacki made an end of speaking and leant forward for a spill.

"But you've never told us just _how_ you discovered the secret of the
divided post and all that," I said, speaking for the four of us.

"Oh, that!" replied Carnacki, puffing vigorously at his pipe. "I
found--on comparing the--photos, that the one--taken in the--daytime,
showed a thicker left-hand gatepost, than the one taken at night by the
flashlight. That put me on to the track. I saw at once that there might
be some mechanical dodge at the back of the whole queer business and
nothing at all of an abnormal nature. I examined the post and the rest
was simple enough, you know.