with, but he had quite enough to answer for. He seems to have
exercised a kind of terrorism over his subordinates, or he would
surely have been betrayed before.

Exactly at what point my investigations had jeopardized his secret I
could not find out, but he evidently thought it was in danger, and
believing Quarles was responsible, he determined to get rid of him.

I was told that he had made two attempts upon his life before the night
he was introduced to him in the Temple. That night Quarles was followed
when he left the Temple, and, as we know, was shot at in Savoy Street.

This attempt failing, the doctor, who had already asked Quarles to dinner
on the following night as an extra precaution, determined to use a method
which had already proved successful.

Quarles's enthusiasm for psychological research could hardly fail to
tempt him into the trap.

No. 7 Manleigh Road belonged to a man in the doctor's employment. It had
been prepared for eventualities some time before--probably tragedies had
occurred in the house which had never been heard of. The house agent was
one of the gang, and when, either by mistake or because he could not help
himself without causing undesirable comment, he let the house to the
young married couple, they were frightened away. The house was then let
to Greaves, a man who had become a danger to the doctor, and in due
course he was found dead in his bed.

Between the fireplace of the haunted room and that of the corresponding
room in No. 5 part of the chimney wall had been removed, so that there