It's hard to say for sure, but one possibility is the old lady who lives in the abandoned house. Her backstory and strange encounters could indicate that she's the ghost.
Not having read Naila Tariq's long novels, we can look at long novels in general to infer. Long novels tend to explore a wide range of themes. Maybe Naila Tariq's long novels cover various themes like love, family, society, or personal growth. They might also have a lot of character development, showing how the characters change and evolve throughout the story. Additionally, long novels often have a rich setting, whether it's a specific time period or a particular place. It's possible that her long novels are also set in interesting and well - described settings that add to the overall atmosphere of the story.
I'm not sure specifically as I haven't read it. But generally, a visual novel often has a story with characters, plot twists, and interactions. Maybe 'the letter ghost visual novel' is about a ghost related to letters in some way, like a ghost that communicates through letters or is haunted by letters.
Once upon a time, there was an old, abandoned mansion on the outskirts of town. People said it was haunted by a powerful ghost. One night, a curious young man named Tom decided to explore it. As he entered, he felt a sudden chill. Then, he heard a loud creaking sound, like an old door opening. In the dim light, he saw a figure in white floating towards him. Tom was so scared that he ran out as fast as he could.
I'm sorry, I haven't specifically read novels by Naila Tariq yet, so I can't recommend any directly. But you can try searching in local libraries or on some major e - book platforms.