"The certainty that the murderer, whoever he was, had not left the house"

We've already had a woman faint! The girl the narrator falls in love with. You know she is worthy of his love because she faints at the sight of the dead man and because she is beautiful.

But she might also be evil and be the murderer.

Nah, after all she is beautiful.

Otherwise, we are still at the inquest, where they have pulled a bunch of men off the street and are listening to evidence while the body is still upstairs cooling. No suspects or anything, just random guys and a coroner talking. The evidence is for them, not the detective, so are the random guys going to solve this thing? In Bleak House they do the same thing the day after Nemo overdoses, so maybe they are deciding if it is a murder? Like the shot to the back of the head isn't a clue. No idea how this works.

Oh, and there is a missing girl and the murderer probably never left the house.

Now if we could just get past the inquest.