Journey into Darkness Paperback – January 1, 1997 by Mark Douglas, John E.; Olshaker 
 
In the #1 New York Times bestseller Mindhunter, John Douglas, who headed the FBI's elite Investigative Support Unit, told the story of his brilliant and terrifying career tracking down some of the most heinous criminals in history. Using behavioral profiling and criminal investigative analysis to get into the head and psyche of both the criminal and victim -- to feel what they felt at the critical moment -- Douglas helped crack many high profile cases, including the Trailside Killer, the Atlanta child murders, and the Tylenol murders. Now, working again with his co-author Mark Olshaker, Douglas delves further into the criminal mind with a series of chilling new cases in Journey into Darkness: Follow the FBI's premier investigative profiler as he penetrates the minds and motives of the most terrifying serial killers. In Journey into Darkness, Douglas profiles vicious serial killers, rapists, and child molesters. He is straightforward, blunt, often irreverent, and outspoken, but takes pains not to glorify any of these murderers. Some of the unique cases Douglas discusses include: The Clairemont killer -- Six women were found stabbed to death in San Diego, three in the same apartment complex. In each case, the killer entered through an unlocked door or window in the late morning to early afternoon. A suspect was in custody, tied to one of the murders through a DNA match. Douglas was called upon to use his profiling techniques to link the other five murders to the suspect. Douglas looked at the "signature" of the killer, and found that all the murders were committed by the same man. The prosecution used the profile to force the jury to find the defendant guilty of all six murders, if they felt he was guilty of the one murder. Celophus Prince was found guilty on all counts.
 
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