A murder involved an old case from ten years ago. The deceased's bright coat was taken off step by step, revealing the ferocious inside. The shrewd detectives found out that each of the suspects had embarrassing secrets, and they all had the motive of getting rid of the deceased and then getting rid of the dead. However, the real murderer was not among them. He had no personal grudges with the deceased. Why did he kill?
This book is a short story, purely a mystery story.
