Such an explanation accounts for many things in London.
The watcher resumed his interrupted progress.

Brett crossed the street and deliberately knocked at the door of a house in which the ground floor was illuminated.
Someone peeped through a blind, the door opened as far as a rattling chain would permit.
"Good evening," said Brett.
"What do you want ?" demanded a suspicious woman.
"Mr.Smith--Mr.Horatio Smith." "He doesn't live here." "Dear me! Isn't this 76 Middle Street ?" "Yes; all the same, there's no Smiths here." The door slammed; but the barrister had attained his object.

The other man had entered No.

37..