Can you recommend a novel about a serial killer?

It was a novel that he had read in the past, but he had forgotten the details. He remembered that the murderer was a painter, right? The female lead and the painter had a good relationship, and the painter had a grumpy ancestor? There seemed to be a police officer, and the police officer was a painter who had once brought the female protagonist to the cave where her ancestors had painted the murals. In the end, the painter wanted to be with the female protagonist forever and almost killed her. Fortunately, the male protagonist's police officer found out ~~~ Pray to the gods!!!!

Answer 1

I recommend " The G Case ". This book is a mystery detective novel. It tells the story of a serial murder in Aoki City. The victim at the crime scene had the mark of " G " on his body. The criminal police and forensic doctors investigated the case and discovered the secret behind the serial murders from ten years ago. Will they successfully catch the murderer? I hope you like my recommendation.😗