Can you recommend a mystery novel?

This novel was mainly about a child who imitated the story of his deceased father's novel and killed his family. In his impression, the child used poison and even burned down the family's laboratory. There was a girl in the family who seemed to be the child's sister. She was blind, and in the end, the child seemed to want to kill the girl.
In the novel about the deceased father, the father himself was the murderer, so he burned his own laboratory to get rid of his suspicion. However, in reality, the child's blind imitation allowed the police (or detectives) to see the truth.
The ending seemed to be that the boy had been poisoned to death by someone who had changed his juice (not sure)

Answer 1

, according to the information you provided, I have a novel here called "Writing a Mystery Story in the World of Ke Xue." It tells the story of Mito Tsuki's ambition to become a detective and mystery novelist in the world of Conan. The plot of being involved in a murder case is very attractive. I hope you like this fairy's recommendation. Muah ~😗