Meta fiction

It was a strange case..strangest case I've ever met. I had been a detective for 20 years and yet never seen this kind of case, a case that has no trace or evidence of the killer. This case was really serious, the killer won't stop killing the next victom. I started searching for similar cases that will give me some idea and finally,, I found a similar case in the old case file.. 

It was a dark stormy night when I first saw him in front of the store. He was a strange man with dark clothes. The next day, he was there again. And the next day and the next... it looked like he was coming there every day with the same dark clothes. And then, strange things began to happen in my town.

The store's owner was dead. His name was Mr.Keven. He was 40years old. Nobody know who killed Mr.Keven. This happened at 1:00 am so nobody saw the crime. Also, There was no CCTV in the store .
I've thought and thought about what happened. It was so strange. Few days later, one more person died on the street. It was really strange. Eric was the person who died. He was 39years old.Police and NCIS found that he visited the store about an hour ago befor he died.The police said that his death and the death of Mr.Keven were connected.So they searched on the computer for any kinds of clu but they couldn't found any.Next day, there was another death.The strange man with dark hat and dark clothes had suicied.His name was Yang.He left the paper and there were names.Keven and Eric.

Actually, Mr.Keven and Mr.Eric have killed Mr.Keven's son. He killed the two people to make his son happy in the upper world, but his son might not want his father to kill other people.

When I read this case, I noticed the reason why there was no evidence of the killer and the crime was perfect. It was because of revenge. If a person is covered with revenge, the person became a monster. I was sure this case was also related to revenge and when I investigate the situation closly, there were some traces of revenge and I could solve the case. This case remind me that revenge was a scary thing and we should never let revenge controll us. 

"CASE SOLVE"