Yes, it might be a novel. There could be a work titled 'Onna Spy Sophia' in the realm of novels, though it's not a widely known mainstream one. It could be a niche or indie novel.
The Kuchisake - onna is a Japanese supernatural entity. In the story, she is often depicted as a woman with a slit mouth. Legend has it that she was once a beautiful woman. But due to her excessive vanity or some misdeeds, her mouth was cut from ear to ear as a punishment. She now wanders, often wearing a surgical mask or covering her face, and when she approaches people and removes the covering, she asks if you think she is beautiful. If you answer no, she might harm you, and if you answer yes, she will slit your mouth like hers.
Kuchisake - Onna has a rather eerie real story. Legend has it that she was once a beautiful noblewoman. But because of her excessive pride in her looks, she was punished in a cruel way. After her transformation into a malevolent spirit, she wanders, especially at night. People in Japanese folklore were very cautious of her, as her presence was seen as a sign of impending doom in some cases.
The 'kuchisake - onna' is a Japanese ghost story. It's about a woman with a slit mouth. Legend has it that she was a beautiful woman who was punished by having her mouth slit from ear to ear. She now wanders, often wearing a mask and asking people if they think she is beautiful. If they answer no, she kills them; if they answer yes, she removes her mask and asks again, and if they show horror at her slit - mouth, she also kills them.