Stephen King, particularly Christine. Ai-chan could grasp all the scenes so perfectly even before Ai-chan found out it had a movie.
As for writing style, probably Agatha Christie. Ai-chan didn't even know this at start, but Ai-chan was informed that Ai-chan's writing style is similar to Agatha Christie. Since Ai-chan's style is already close to Agatha Christie, it's much easier to get it closer to her style than to refuse it and start over with a style that Ai-chan can't intuitively grasp. She's also a very popular author, so Ai-chan doesn't feel like emulating her is a bad idea.
The beginnings of her works are strong on description, which gradually drop off as dialogue and interaction between characters take over. With shorter sentences and sharp dialogue, she hurries readers along to what's always a captivating conclusion. Agatha preferred to plot her crime stories from the murder itself.
Funny right? Other people in this thread wants to emulate Japanese light novel but as Japanese Ai-chan wants to emulate the authors of their country.