I don't have a definite answer. It's possible that Leon is a relatively new or niche author of historical novels, and the clue is intended to challenge your knowledge of less mainstream literary figures.
Well, there are numerous authors who write ghost stories. It could be someone like Stephen King or Shirley Jackson, but it really depends on the particular story you have in mind.
That's a tough one. Ghost stories are written by a wide range of authors. Maybe you could give me a hint about the style or plot of the story, and then I could try to make a better guess.
Kellerman is a well-known mystery novelist whose works featuring Rina Lazarus are popular in the crossword world. Not much more is known about them specifically for this context.
A crossword solver for a long story could be a person who is really good at solving crosswords related to long - form narratives. This might be someone with a vast vocabulary and knowledge of literature. They would be able to decipher clues that are based on characters, plot elements, or themes from long stories.
I don't know the author of 'the book ghost story' as this title is quite generic. There might be various books with this name out there, each written by different authors.
I'm not sure who the author of 'Anxiety a Ghost Story' is. There could be many works with this title, and without more context, it's difficult to determine the specific author.
There's not enough information to determine the author of the 'taeyang ghost story'. It might be a relatively unknown person named Taeyang, or it could be a pen name for someone who wants to remain anonymous. It could also be a story passed down within a certain community, in which case the original author might be hard to trace.