The killer inside me

I I started a new book called The Killer Inside Me. It's a really creepy book about this killer who has a sickness. In the book it is through his eyes. He is a police officer in a town in Texas and he is evil. Whenever something angers him he kills a person. This book is a little to creepy for me but I want to finish it. His name is Lou. In the book people who know him say. He's calm and a gentleman, but then he turns out to be a monster. At the part I am at, he has already killed three people. Two of which did nothin bad to him. He was ordered to make these two criminals get out of the town and he ended up killing them both. After this others find one and find out she is alive. This book is different because instead of it being told through a narrator or a person other than the killer, he is telling it. Since he tells the story, it is hard to follow because his reasons of killing people make no sense. He says that he has this sickness which forces him to do these things. Also, he finds out that his brother was murdered by a man that he works under, this really doesn't tie into the story but for some reason he mentions it a lot. I think it is trying to point out that he can't complain about this considering how big if a monster he is himself. This one part says that he is dealing with a man in jail who is high. The man tries to escape by pushing Lou but instead of using force and hurting the man, Lou just lets the man tired himself out. He says that he has to much pride to hurt someone that is high. This shows that he is not mentally stable because he kills innocent people all the time.