John Douglas writes true crime and forensic psychology based on his work in the FBI's behavioural science and criminal profiling programmes, usually with co-author Mark Olshaker. Mindhunter recounts interviews with serial offenders and the development of behavioural profiling, linking individual cases to the methods used to infer an unknown offender's habits and motives. Journey into Darkness and The Anatomy of Motive continue with murder, sexual violence and investigative reasoning, while The Killer Across the Table returns to four cases through extended discussions of offender psychology. Douglas's books combine memoir, case reconstruction and explanation of investigative techniques, with an emphasis on interviewing, victimology and patterns across crimes. The strongest discovery links are true crime, criminal psychology and law-enforcement memoir, especially where the interest is in profiling as an investigative tool rather than a catalogue of notorious killers. Read more Less