I'm not aware of any particular author for a 'dark fall novel' as the name is quite general. There could be multiple novels with this title by different authors.
The 'dark fall novel' could potentially be about a personal journey of a character into darkness. It might explore themes like loss, despair, and the human condition. For example, the protagonist could experience a series of tragedies during the fall season, which leads them on a path of self - discovery in a very dark and challenging way. The fall could symbolize the decay of their previous life or beliefs, and the story could be about how they navigate through this new, dark reality.
I'm not sure specifically what 'Cap deage' means. It could be a very specific term, a misspelling, or something relatively unknown. It might be a proper name, a local term in a certain area or a very niche concept.
Well, in the 'Fall of the Dark Brotherhood Story', it might tell of how the Dark Brotherhood, which is usually a secretive and often feared assassin - like organization in many fictional universes. Their fall could be due to a hero or a group of heroes who decided to take them on. Maybe they were getting too powerful and attracting too much unwanted attention, so various factions united against them. It could also be because of a schism within their own ranks, where different ideologies clashed and tore the organization apart from the inside.
I don't have enough information to say exactly who Cap'n Kathy is. She could be an original character created by the fan fiction writer. Maybe she's a pirate - the 'cap'n' part could suggest that - who has some connection to the wizarding world of Harry Potter.
I'm not sure specifically as it depends on the particular version of the 'Fall of the Dark Brotherhood Story'. But it could include leaders within the Dark Brotherhood and those who oppose them.
The cap man and monkey story is an interesting one. There was this cap man who was traveling around selling his caps. He reached a place near a forest and decided to take a rest under a tree. While he was sleeping, the monkeys in the tree noticed the caps. They climbed down, grabbed the caps, and went back up the tree. When the man woke up, he was confused at first, then saw the monkeys with his caps. He was worried as those caps were his livelihood. But then he remembered that monkeys often mimic human actions. So he took off his own cap and tossed it. The monkeys, being the imitators they are, did the same with the caps they had taken, and the cap man got his caps back.