Marshall McCabe, a happy go lucky crime beat reporter, stumbles onto a young man who has no name. Mac found him one night kneeling in front of the Baltimore Basilica.The story, Mac wrote about this incident, would be titled "The Angel of Darkness." Several days later, the Baltimore City Police Department learns that his name is Paul Delflume, the younger brother of Jon Delflume.Mac, following his gut instincts, decides that there is more than meets the eye and follows the brothers to Saratoga Springs, New York. What he learns there leads him to Scranton, Pennsylvania. Mac now knows he is onto something very special and shares his suspicions with the newspaper's lawyer.He is advised to contact the Federal Bureau of Investigation and soon after, Special Agent Peter Franks, hi-jacks Mac because of his relationship with the Delflume brothers.Marshall McCabe soon learns that he will be working inside the very prestigious Behavioral Analysts Unit of the FBI. Years later, Mac writes a novel titled "Crucifix" telling his story as an insider who witnessed first hand what has become a case study for the FBI-BAU.