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Bill and Holden consult with Dr. Wendy Carr to begin classifying their subjects. They receive surprising news.
Dr. Wendy Carr joins Holden and Tench in their first success, when their insights lead to an arrest.
Holden and Bill return to a perplexing case in Pennsylvania where a set of clues leading in multiple directions leaves no shortage of suspects.
In the late 1970s two FBI agents expand criminal science by delving into the psychology of murder and getting uneasily close to all-too-real monsters.