The famous psychiatrist V.P. Serbsky became the founder of forensic psychiatry. It was he who was one of the first to seriously think about the advisability of applying generally accepted penalties for misconduct to the mentally ill. Was the person aware of his actions at the time of the crime? And if the answer to this question is no, then does it deserve punishment? The doctor believed that such criminals should be treated, not punished. But how to determine where the sick person is, and where is the simulator? Based on a huge clinical material, V.P. Serbsky was the first to develop and describe a forensic psychiatric examination algorithm. The book contains the most interesting and complex cases that the famous psychiatrist had to deal with.