The author initiates us into the secrets of forensic science. What exactly should be examined first at a crime scene? Where can fingerprints be left and how to look for them? What technologies do forensic scientists use? In answering these and other important questions, the author draws on the experience of the Israeli police, known for their efficiency. Boris Geller generously shares his knowledge, recalls cases from his own practice, talks about the history of the formation of criminology and the state of criminological services in many countries of the world, including Russia. The book also contains interviews of the author with colleagues and stories of many terrible crimes, which the skill of criminologists helped to solve.