Elena Topilskaya, a former investigator with many years of experience, the author of the scripts for everyone’s favorite television series “Secrets of Investigation”, describes the mechanism for solving especially dangerous crimes. In real stories dedicated to the management of the most complex cases, the author pricks the painstaking work of the investigator with evidence, reveals the reasons for criminal intentions. The intricacies of the work of criminologists and forensic doctors, step by step, bring the completion of the court case closer, are professionally accurately described.