His disease was of a kind that is brought on by excessive drinking, and that affects the mind as well as the body.

The people at the public house call it the Horrors.
Hearing these things, Robert determined to see if he could not find out something more for himself by going and inquiring at the public house, in the character of one of the friends of the sick man in bed upstairs.
He made two important discoveries.

First, he found out the name and address of the doctor in attendance.

Secondly, he entrapped the barman into mentioning the murderous wretch by his name.

This last discovery adds an unspeakably fearful interest to the dreadful misfortune of Mary's death.