Serial killers have been devastating society for centuries, even before Jack the Ripper. For every effect there is a cause, there is always a reason why people do things. As far as serial crimes are concerned, it always comes back to what brought the perpetrator there. When a crime is committed, it can be a simple motive such as lust or money. When a serial crime is committed it means there is more than just an accident, they like what they are doing. To find and capture these horrible individuals, the use of psychology is now an important factor. The book “Mind Hunter” explains in depth how the use of psychology can create a profile and catch a criminal. By psychoanalyzing the criminal, the victim, the crime scene and any other available resources, you can enter the mind of the offender and create a psychological profile. This profile includes everything from an idea of ​​what kind of childhood they had to what they might look like. All information can be found by analyzing the crime. The first way to find a criminal and create a profile is to start with the victim. In all serial murders, the most important evidence is the victim's body. When the elderly, prostitutes or children are killed, one of the many reasons is their vulnerability. This usually indicates an inexperienced killer due to lack of knowledge on how to overpower a human being and make him do what he wants. For first-time killers, prostitutes are usually a good option because they usually have no known location and can go unnoticed if missing. When you have an idea of ​​how a victim reacted to the crime, you can get an idea of ​​how the offender approached the situation. The only thing the criminal had on his mind was... middle of paper... his actions once he was freed. Under free will they can do what they want to satisfy their desires, but under a controlled injunction like prison they can be stable. To conclude, in the modern world of catching criminals, psychology plays an important role. Psychology helps create a profile of any offender, be it a serial killer or a rapist. The book “Mind Hunter” opens the world of knowledge about criminal psychology and the psychology behind serial crimes. Behavior reflects personality and profiling behavior can lead to catching the offender. There is a psychological reason behind every feature of the event and every action committed by a criminal. During the interrogation, the interviewer uses psychological techniques to get into the suspect's head and confess. When you can think like a killer, you can catch the killer. The only way to enter the mind is through psychology.