When the student is ready, the teacher appears. The only problem is, in this online classroom the students are would-be serial killers eager to learn the tricks of the trade from a master, the enigmatic Cain42. FBI consultant Esme Stuart is struggling to stanch the doubt and fear eating away at her marriage. Now a seedy true-crime writer is dredging up the deadly confrontation that nearly destroyed her. But the link between Esme's old enemy and this...