David Berkowitz is rightfully considered one of the most dangerous living serial killers in the world. In 1976, a 23-year-old young man turned shooting into his hobby. Every month, David Berkowitz went for a walk in the park to find a couple of teenagers secluded in a car and shoot them. For a long time, people simply did not want to notice his crimes. And then David had to write several letters, the contents of which literally paralyzed New York. The messages were sent on behalf of a certain Son of Sam. The sender was discovered only after a year and a half. Who is David Berkowitz? What made him kill and who is this mysterious Sam? Was Berkowitz insane or should we accept that normal people can kill for fun? How did a serial killer manage to become a preacher with an army of thousands of fans and what made him cooperate with the FBI? Read about all this true-crime investigation by criminal psychologist Mickey Knox, based on letters, interviews and conversations with psychiatrists. The publishing layout of the book is saved in PDF A4 format.