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trouble is that its windows in the first floor bedrooms open at night
spontaneously.

People have slept at night for a reward in this house closing the
windows with their own hands and have waked up at night shivering with
cold to find all the windows open.

Once a body of soldiers went to pass a night in this house with a view
to solve the mystery. They all sat in a room fully determined not to
sleep but see what happened; and thus went on chatting till it was about
midnight. There was a big lamp burning on a table around which they were
seated. All of a sudden there was a loud click--the lamp went out and
all the windows opened simultaneously. The next minute the lamp was
alight again. The occupants of the room looked at their watches; it was
about 1 A.M. The next night they sat up again and one of them with a
revolver. At about one in the morning this particular individual pointed
his revolver at one of the windows. As soon as the lamp went out this
man pulled the trigger five times and there were five reports. The
windows, however, opened and the lamp was alight again as on the
previous night. They all rushed to the window to see if any damage had
been done by the bullets.

The five bullets were found in the room but from their appearance it
seemed as if they had struck nothing, evidently the bullets would have
been changed in shape if they had impinged upon any hard substance. But
then this was another enigma. How did the bullets come back? No man
could have put the bullets there from before, (for they were still hot
when discovered) or could have guessed the bore of the revolver that was
going to be used.

On the third night to make assurance doubly sure, these soldiers were
again present in the room, but on this occasion they had loaded their
revolver with marked bullets.

As it neared one o'clock, one of them pointed the revolver at the
window. He had decided to pull the trigger as soon as the lamp would go
out. But he could not. As soon as the lamp went out this soldier
received a sharp cut on his wrist with a cane and the revolver fell
clattering on the floor. The invisible hand had left its mark behind
which his companions saw after the lamp was alight again.

Many people have subsequently tried to solve the mystery but never
succeeded.

The house remained untenanted for a long time and finally it was rented
by an Australian horse dealer who however did not venture to occupy the
building itself, a