In which it is proved that, notwithstanding their names’ ending in OS and IS, the heroes of the story which we are about to have the honor to relate to our readers have nothing mythological about them.
The three musketeers
1: in which Sophie talks to hats. 2: in which Sophie is compelled to seek her fortune. 17: In which the moving castle moves house.
Howel's moving castle chapters titles
I can't understand what (In which) means at the beginning of the sentence even after looking for it on the internet. The closest thing I found was this:
“In which” is a combination of a preposition (in) and a relative pronoun (which). You can use “in which” as a precise way to introduce a relative clause after a noun that refers to a place or to a time.
In this case there is no relative clause to introduce. I know it can mean (Where) when talking about physical things but here it seems so ambiguous. It is not just (even though our heroes' names end with OS and IS there is nothing magical about them), like if (In Which) adds another meaning to this that I can't grasp.
The same goes for (in which Sophie talks to hats), Sophie is talking to hats and I don't understand what role (In which) is playing in the sentence here. As if it alters the simple meaning I draw out.