Legendary FBI profiler and Jack Crawford prototype from the famous Silence of the Lambs John Douglas explores the source of all crimes: the motive of the killer. Why does a criminal kill? What motives drive him? Resentment? Revenge? Lust? Thirst for recognition and fame? One of the founders of criminal profiling, the famous FBI special agent John Douglas considers this issue key in understanding the identity of the killer - and, accordingly, his capture. By answering the question "Why?," You can answer the question "Who?" - and solve the riddle. Exploring different motives and methods of crime, John Douglas talks about the most common types of serial and mass murderers. It highlights common elements in their biographies and shows how this knowledge can be applied to other types of crime. Using the exciting stories - the Harvey Lee Oswald case, the Unabomber case, the assassination of Gianni Versace and many others - the legendary Mindhunter immerses us in the minds of rapists, poisoners, terrorists, arsonists and assassins. He clearly explains why people go to certain crimes, and teaches to recognize potential killers before it is too late...